Company lists · Data refreshed September 2026
Top 25 Annotation companies based in the United States
RevenueBase identified 89 company matches for annotation companies associated with the United States as of September 2026 and tracks 7,733 professional contacts across them, including 913 with verified work emails and 387 with mobile numbers. San Francisco is the largest hub.
This list covers company matches for annotation companies associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 7, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest annotation companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,272 contacts → | ||||
Exact match “Objectways is an AI data solutions company trusted by Fortune 500 enterprises and high-growth AI teams worldwide.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 2 | 977 contacts → | ||||
Exact match “provides ML data operations support with Human-in-the-loop for LLMs and autonomous systems, focusing on AI/ML model training and annotation services.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 3 | 899 contacts → | ||||
Exact match “With 30+ years of experience in data annotation, we support AI innovators to build smarter AI.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 4 | 654 contacts → | ||||
Exact match “Productive Playhouse is the execution partner technical program managers trust when scale, compliance, and quality can’t slip.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 5 | 526 contacts → | ||||
Exact match “Pareto.AI is a talent-first human data collection platform for AI research, empowering the top 0.01% of expert labelers to deliver the highest-quality training data.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 6 | 356 contacts → | ||||
Exact match “SuperAnnotate bridges the gap between cutting-edge AI innovation and the high-quality human data that powers it - helping advanced AI teams build more intelligent models.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 7 | 328 contacts → | ||||
Exact match “Shaip, by Ubiquity, provides end-to-end AI data services-data collection, licensing, validation, transcription, and annotation-across text, audio, image, and video.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 8 | 148 contacts → | ||||
Exact match “Label Your Data is a data annotation & labeling company.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 9 | 116 contacts → | ||||
Exact match “Liberty Source PBC is a U.S-based provider of human-in-the-loop data services that help companies realize maximum value from their Artificial Intelligence, Machine Learning, and…” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 10 | 107 contacts → | ||||
Exact match “Roboflow creates software-as-a-service products to make building with computer vision easy.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 11 | 104 contacts → | ||||
Exact match “The AI Data Labeling Marketplace: Find, hire, and securely pay vetted AI Trainers/data labelers across 110+ countries & any domain expertise.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 12 | 95 contacts → | ||||
Exact match “CVAT (Computer Vision Annotation Tool) is a leading platform for building high-quality visual datasets for vision AI.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 13 | 78 contacts → | ||||
Exact match “HumanSignal enables data science teams to build AI models with their company DNA.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 14 | 76 contacts → | ||||
Exact match “AI Workspace has bagged a unique position in deliberating Sourcing, Data Annotation, and Generative AI services thereby initializing supervised learning for Machine Learning…” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 15 | 74 contacts → | ||||
Exact match “Anolytics is a leading provider of AI data solutions, with offices in India and the USA.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 16 | 59 contacts → | ||||
Exact match “Centaur.ai data empowers you to build and deploy high-stakes AI.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 17 | 54 contacts → | ||||
Exact match “At Keymakr, we provide exceptional image and video data annotation, data creation, data collection, and data validation services for AI/ML computer vision projects of all sizes.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 18 | 48 contacts → | ||||
Exact match “Alegion has the most powerful and flexible annotation platform for training data in market.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 19 | 45 contacts → | ||||
Exact match “With a deep dedication to creating ground-breaking tools plus large-scale human insight, we address the pain points of curating data for machine learning and other artificial…” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 20 | 39 contacts → | ||||
Exact match “Worca provides human intelligence for AI.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 21 | 39 contacts → | ||||
Exact match “Data Labeler specializes in providing reliable and high-quality training data sets for Machine Learning/Artificial Intelligence initiatives.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 22 | 36 contacts → | ||||
Exact match “AI Inspired by Data " maadaa.ai, founded in 2015, is a comprehensive AI data service company supplying the AI industry with professional data services in text, voice, image, and…” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 23 | 30 contacts → | ||||
Exact match “Every vision model starts with labeled data.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 24 | 26 contacts → | ||||
Exact match “We are a data services company specializing in data collection and annotation for Large Language Models (LLM), generative AI, and computer vision.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
| 25 | 22 contacts → | ||||
Exact match “StardustAI provides data annotation and data management services to global artificial intelligence companies.” Recorded in the RevenueBase company graph · Sep 7, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “annotation companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 89 annotation companies based in the United States
See the full list, filter by size, metro and specialty, and access 913 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Annotation companies based in the United States at a glance
As of Sep 7, 2026Companies by employee count
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Company records associated with the United States whose business descriptions match “annotation companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 913 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 7, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “annotation companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many annotation companies are there based in the United States?
RevenueBase identified 89 company matches for annotation companies associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Objectways tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most annotation companies?
San Francisco leads with 12 company records, followed by New York (9) and Los Angeles (5).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 913 professional contacts with verified work emails tracked across these 89 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 7, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Annotation companies based in India
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States
- Media companies based in the United States
- Oil and gas companies based in the United States
Company intelligence · public preview
Top 25 annotation companies based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 89 matching company records for annotation companies based in the United States, with 7,733 tracked contacts and 913 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 7, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 annotation companies based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Objectwaysobjectways.comHQ: Scottsdale, AZ, United StatesReported employees: 1,001-5,000 | Scottsdale, AZ, United States | 1,001-5,000 | Exact match | 1,272 contacts → |
“Objectways is an AI data solutions company trusted by Fortune 500 enterprises and high-growth AI teams worldwide.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Digital Divide Data DDDdigitaldividedata.comHQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 977 contacts → |
“provides ML data operations support with Human-in-the-loop for LLMs and autonomous systems, focusing on AI/ML model training and annotation services.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Sigma AIsigma.aiHQ: Miami, FL, United StatesReported employees: 501-1,000 | Miami, FL, United States | 501-1,000 | Exact match | 899 contacts → |
“With 30+ years of experience in data annotation, we support AI innovators to build smarter AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Productive Playhouseproductiveplayhouse.comHQ: Los Angeles, CA, United StatesReported employees: 201-500 | Los Angeles, CA, United States | 201-500 | Exact match | 654 contacts → |
“Productive Playhouse is the execution partner technical program managers trust when scale, compliance, and quality can’t slip.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | pareto.aipareto.ai HQ: Stanford, CA, United StatesReported employees: 51-200 | Stanford, CA, United States | 51-200 | Exact match | 526 contacts → |
“Pareto.AI is a talent-first human data collection platform for AI research, empowering the top 0.01% of expert labelers to deliver the highest-quality training data.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Superannotatesuperannotate.comHQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 356 contacts → |
“SuperAnnotate bridges the gap between cutting-edge AI innovation and the high-quality human data that powers it - helping advanced AI teams build more intelligent models.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  SHAIPshaip.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 328 contacts → |
“Shaip, by Ubiquity, provides end-to-end AI data services-data collection, licensing, validation, transcription, and annotation-across text, audio, image, and video.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Label Your Datalabelyourdata.comHQ: Wilmington, DE, United StatesReported employees: 201-500 | Wilmington, DE, United States | 201-500 | Exact match | 148 contacts → |
“Label Your Data is a data annotation & labeling company.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Liberty Source PBCliberty-source.comHQ: Hampton, VA, United StatesReported employees: 51-200 | Hampton, VA, United States | 51-200 | Exact match | 116 contacts → |
“Liberty Source PBC is a U.S-based provider of human-in-the-loop data services that help companies realize maximum value from their Artificial Intelligence, Machine Learning, and…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Roboflowroboflow.comHQ: Remote, United StatesReported employees: 51-200 | Remote, United States | 51-200 | Exact match | 107 contacts → |
“Roboflow creates software-as-a-service products to make building with computer vision easy.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Opentrain AIopentrain.aiHQ: Seattle, WA, United StatesReported employees: Not recorded | Seattle, WA, United States | Not recorded | Exact match | 104 contacts → |
“The AI Data Labeling Marketplace: Find, hire, and securely pay vetted AI Trainers/data labelers across 110+ countries & any domain expertise.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  cvat.aicvat.aiHQ: Wilmington, DE, United StatesReported employees: 11-50 | Wilmington, DE, United States | 11-50 | Exact match | 95 contacts → |
“CVAT (Computer Vision Annotation Tool) is a leading platform for building high-quality visual datasets for vision AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Humansignalhumansignal.comHQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 78 contacts → |
“HumanSignal enables data science teams to build AI models with their company DNA.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  AIW AI Workspaceai-workspace.comHQ: Wilmington, DE, United StatesReported employees: 1,001-5,000 | Wilmington, DE, United States | 1,001-5,000 | Exact match | 76 contacts → |
“AI Workspace has bagged a unique position in deliberating Sourcing, Data Annotation, and Generative AI services thereby initializing supervised learning for Machine Learning…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Anolyticsanolytics.aiHQ: Levittown, NY, United StatesReported employees: 1,001-5,000 | Levittown, NY, United States | 1,001-5,000 | Exact match | 74 contacts → |
“Anolytics is a leading provider of AI data solutions, with offices in India and the USA.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  centaur.aicentaur.aiHQ: Boston, MA, United StatesReported employees: 51-200 | Boston, MA, United States | 51-200 | Exact match | 59 contacts → |
“Centaur.ai data empowers you to build and deploy high-stakes AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Keymakr Data Labelingkeymakr.comHQ: New York, NY, United StatesReported employees: 501-1,000 | New York, NY, United States | 501-1,000 | Exact match | 54 contacts → |
“At Keymakr, we provide exceptional image and video data annotation, data creation, data collection, and data validation services for AI/ML computer vision projects of all sizes.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Alegionalegion.comHQ: Austin, TX, United StatesReported employees: 51-200 | Austin, TX, United States | 51-200 | Exact match | 48 contacts → |
“Alegion has the most powerful and flexible annotation platform for training data in market.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  AI Data Innovationsaidatainnovations.comHQ: Bellevue, WA, United StatesReported employees: 51-200 | Bellevue, WA, United States | 51-200 | Exact match | 45 contacts → |
“With a deep dedication to creating ground-breaking tools plus large-scale human insight, we address the pain points of curating data for machine learning and other artificial…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  WORCAworca.ioHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 39 contacts → |
“Worca provides human intelligence for AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Data Labelerdatalabeler.comHQ: Cherry Hill, NJ, United StatesReported employees: 11-50 | Cherry Hill, NJ, United States | 11-50 | Exact match | 39 contacts → |
“Data Labeler specializes in providing reliable and high-quality training data sets for Machine Learning/Artificial Intelligence initiatives.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  maadaa.aimaadaa.aiHQ: Union City, CA, United StatesReported employees: 201-500 | Union City, CA, United States | 201-500 | Exact match | 36 contacts → |
“AI Inspired by Data " maadaa.ai, founded in 2015, is a comprehensive AI data service company supplying the AI industry with professional data services in text, voice, image, and…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Lexdata Labslexdatalabs.comHQ: Boston, MA, United StatesReported employees: 51-200 | Boston, MA, United States | 51-200 | Exact match | 30 contacts → |
“Every vision model starts with labeled data.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Cambridge Bizservecambridgebizserve.comHQ: Peachtree Corners, GA, United StatesReported employees: 501-1,000 | Peachtree Corners, GA, United States | 501-1,000 | Exact match | 26 contacts → |
“We are a data services company specializing in data collection and annotation for Large Language Models (LLM), generative AI, and computer vision.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Stardust AIstardust.aiHQ: San Francisco, United StatesReported employees: 51-200 | San Francisco, United States | 51-200 | Exact match | 22 contacts → |
“StardustAI provides data annotation and data management services to global artificial intelligence companies.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 89 company matches
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Annotation companies: dataset insights
September 7, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
89 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 7, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for annotation companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many annotation companies did RevenueBase find based in the United States?
The saved snapshot records 89 matching company records, 7,733 tracked contacts and 913 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 7, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Annotation companies by geography
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 annotation companies based in the United States. Snapshot: September 7, 2026. https://revenuebase.ai/companies/annotation-companies/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Annotation companies based in India
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States
- Media companies based in the United States
- Oil and gas companies based in the United States
Company intelligence · public preview
Top 25 annotation companies based in the United States
RevenueBase records 89 matching company records for annotation companies based in the United States, with 7,733 tracked contacts and 913 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 7, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 annotation companies based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Objectwaysobjectways.com HQ: Scottsdale, AZ, United StatesReported employees: 1,001-5,000 | Scottsdale, AZ, United States | 1,001-5,000 | Exact match | 1,272 contacts → |
“Objectways is an AI data solutions company trusted by Fortune 500 enterprises and high-growth AI teams worldwide.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Digital Divide Data DDDdigitaldividedata.com HQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 977 contacts → |
“provides ML data operations support with Human-in-the-loop for LLMs and autonomous systems, focusing on AI/ML model training and annotation services.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Sigma AIsigma.ai HQ: Miami, FL, United StatesReported employees: 501-1,000 | Miami, FL, United States | 501-1,000 | Exact match | 899 contacts → |
“With 30+ years of experience in data annotation, we support AI innovators to build smarter AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Productive Playhouseproductiveplayhouse.com HQ: Los Angeles, CA, United StatesReported employees: 201-500 | Los Angeles, CA, United States | 201-500 | Exact match | 654 contacts → |
“Productive Playhouse is the execution partner technical program managers trust when scale, compliance, and quality can’t slip.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | pareto.aipareto.ai HQ: Stanford, CA, United StatesReported employees: 51-200 | Stanford, CA, United States | 51-200 | Exact match | 526 contacts → |
“Pareto.AI is a talent-first human data collection platform for AI research, empowering the top 0.01% of expert labelers to deliver the highest-quality training data.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Superannotatesuperannotate.com HQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 356 contacts → |
“SuperAnnotate bridges the gap between cutting-edge AI innovation and the high-quality human data that powers it - helping advanced AI teams build more intelligent models.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | SHAIPshaip.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 328 contacts → |
“Shaip, by Ubiquity, provides end-to-end AI data services-data collection, licensing, validation, transcription, and annotation-across text, audio, image, and video.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Label Your Datalabelyourdata.com HQ: Wilmington, DE, United StatesReported employees: 201-500 | Wilmington, DE, United States | 201-500 | Exact match | 148 contacts → |
“Label Your Data is a data annotation & labeling company.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Liberty Source PBCliberty-source.com HQ: Hampton, VA, United StatesReported employees: 51-200 | Hampton, VA, United States | 51-200 | Exact match | 116 contacts → |
“Liberty Source PBC is a U.S-based provider of human-in-the-loop data services that help companies realize maximum value from their Artificial Intelligence, Machine Learning, and…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Roboflowroboflow.com HQ: Remote, United StatesReported employees: 51-200 | Remote, United States | 51-200 | Exact match | 107 contacts → |
“Roboflow creates software-as-a-service products to make building with computer vision easy.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Opentrain AIopentrain.ai HQ: Seattle, WA, United StatesReported employees: Not recorded | Seattle, WA, United States | Not recorded | Exact match | 104 contacts → |
“The AI Data Labeling Marketplace: Find, hire, and securely pay vetted AI Trainers/data labelers across 110+ countries & any domain expertise.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | cvat.aicvat.ai HQ: Wilmington, DE, United StatesReported employees: 11-50 | Wilmington, DE, United States | 11-50 | Exact match | 95 contacts → |
“CVAT (Computer Vision Annotation Tool) is a leading platform for building high-quality visual datasets for vision AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Humansignalhumansignal.com HQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 78 contacts → |
“HumanSignal enables data science teams to build AI models with their company DNA.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | AIW AI Workspaceai-workspace.com HQ: Wilmington, DE, United StatesReported employees: 1,001-5,000 | Wilmington, DE, United States | 1,001-5,000 | Exact match | 76 contacts → |
“AI Workspace has bagged a unique position in deliberating Sourcing, Data Annotation, and Generative AI services thereby initializing supervised learning for Machine Learning…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Anolyticsanolytics.ai HQ: Levittown, NY, United StatesReported employees: 1,001-5,000 | Levittown, NY, United States | 1,001-5,000 | Exact match | 74 contacts → |
“Anolytics is a leading provider of AI data solutions, with offices in India and the USA.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | centaur.aicentaur.ai HQ: Boston, MA, United StatesReported employees: 51-200 | Boston, MA, United States | 51-200 | Exact match | 59 contacts → |
“Centaur.ai data empowers you to build and deploy high-stakes AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Keymakr Data Labelingkeymakr.com HQ: New York, NY, United StatesReported employees: 501-1,000 | New York, NY, United States | 501-1,000 | Exact match | 54 contacts → |
“At Keymakr, we provide exceptional image and video data annotation, data creation, data collection, and data validation services for AI/ML computer vision projects of all sizes.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Alegionalegion.com HQ: Austin, TX, United StatesReported employees: 51-200 | Austin, TX, United States | 51-200 | Exact match | 48 contacts → |
“Alegion has the most powerful and flexible annotation platform for training data in market.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | AI Data Innovationsaidatainnovations.com HQ: Bellevue, WA, United StatesReported employees: 51-200 | Bellevue, WA, United States | 51-200 | Exact match | 45 contacts → |
“With a deep dedication to creating ground-breaking tools plus large-scale human insight, we address the pain points of curating data for machine learning and other artificial…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | WORCAworca.io HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 39 contacts → |
“Worca provides human intelligence for AI.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Data Labelerdatalabeler.com HQ: Cherry Hill, NJ, United StatesReported employees: 11-50 | Cherry Hill, NJ, United States | 11-50 | Exact match | 39 contacts → |
“Data Labeler specializes in providing reliable and high-quality training data sets for Machine Learning/Artificial Intelligence initiatives.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | maadaa.aimaadaa.ai HQ: Union City, CA, United StatesReported employees: 201-500 | Union City, CA, United States | 201-500 | Exact match | 36 contacts → |
“AI Inspired by Data " maadaa.ai, founded in 2015, is a comprehensive AI data service company supplying the AI industry with professional data services in text, voice, image, and…” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Lexdata Labslexdatalabs.com HQ: Boston, MA, United StatesReported employees: 51-200 | Boston, MA, United States | 51-200 | Exact match | 30 contacts → |
“Every vision model starts with labeled data.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Cambridge Bizservecambridgebizserve.com HQ: Peachtree Corners, GA, United StatesReported employees: 501-1,000 | Peachtree Corners, GA, United States | 501-1,000 | Exact match | 26 contacts → |
“We are a data services company specializing in data collection and annotation for Large Language Models (LLM), generative AI, and computer vision.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Stardust AIstardust.ai HQ: San Francisco, United StatesReported employees: 51-200 | San Francisco, United States | 51-200 | Exact match | 22 contacts → |
“StardustAI provides data annotation and data management services to global artificial intelligence companies.” Recorded description excerpt · September 7, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 89 company matches
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Annotation companies: dataset insights
September 7, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
89 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 7, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for annotation companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many annotation companies did RevenueBase find based in the United States?
The saved snapshot records 89 matching company records, 7,733 tracked contacts and 913 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 7, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 annotation companies based in the United States. Snapshot: September 7, 2026. https://revenuebase.ai/companies/annotation-companies/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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