Company lists · Data refreshed November 2026
Top 25 Text annotation platforms worldwide
RevenueBase identified 392 company matches for text annotation platforms worldwide as of November 2026 and tracks 10,564 professional contacts across them, including 902 with verified work emails. India is the largest market and Bangalore the largest hub.
This list covers company matches for text annotation platforms worldwide, 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 November 5, 2026. Country and city lists for text annotation platforms follow the table.
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 text annotation platforms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 954 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 · Nov 5, 2026 · View company records in RevenueBase | |||||
| 2 | 783 contacts → | ||||
Exact match “Toloka is the global leader in human-powered data solutions for AI development.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 3 | 748 contacts → | ||||
Exact match “With 27+ years of experience, Welo Data is the human-centered infrastructure for globally effective AI.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 4 | 660 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 · Nov 5, 2026 · View company records in RevenueBase | |||||
| 5 | 366 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 · Nov 5, 2026 · View company records in RevenueBase | |||||
| 6 | 191 contacts → | ||||
Exact match “Supahands provides fully managed data labelling services for machine learning.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 7 | 171 contacts → | ||||
Exact match “Welcome to TAGFact, your premier media intelligence and data annotation/labeling solution.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 8 | 160 contacts → | ||||
Exact match “Label Your Data is a specialist AI training data provider for teams building AI systems in complex environments.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 9 | 123 contacts → | ||||
Exact match “Prosessor.AI is a high-grade AI/ML data provider company for a smarter world.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 10 | 120 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 · Nov 5, 2026 · View company records in RevenueBase | |||||
| 11 | 108 contacts → | ||||
Exact match “Fueling the AI age.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 12 | 106 contacts → | ||||
Exact match “HumanSignal enables data science teams to build AI models with their company DNA.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 13 | 105 contacts → | ||||
Exact match “Data labeling solutions for artificial intelligence learning Computer Vision Natural language treatment Speech recognition” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 14 | 103 contacts → | ||||
Exact match “DataEQ uses a Crowd of humans to label millions of unstructured data points.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 15 | 102 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 · Nov 5, 2026 · View company records in RevenueBase | |||||
| 16 | 101 contacts → | ||||
Exact match “Kognic provides the most productive annotation platform for autonomy data.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 17 | 73 contacts → | ||||
Exact match “Globose Technology Solutions is an AI based data collection and data annotation company specialising in providing high quality training data for machine learning and artificial…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 18 | 71 contacts → | ||||
Exact match “With AI and machine learning being evolved as the fastest-growing technologies that offer incredible innovations that benefit various sectors of the global economy, Annotations &…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 19 | 71 contacts → | ||||
Exact match “AIMMO creates a large volume of training data accurately and quickly so that more industries and enterprises can utilize AI.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 20 | 62 contacts → | ||||
Exact match “Centaur.ai data empowers you to build and deploy high-stakes AI.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 21 | 60 contacts → | ||||
Exact match “Frinksyn which is situated in West Bengal, India, where we provide workforce support for AI/Machine Learning Data Annotation and Content Moderation services, Having business…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 22 | 56 contacts → | ||||
Exact match “Sakhsham Knowledge Services provides human-in-the-loop, plug-and-play process support services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 23 | 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 · Nov 5, 2026 · View company records in RevenueBase | |||||
| 24 | 54 contacts → | ||||
Exact match “Alegion has the most powerful and flexible annotation platform for training data in market.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 25 | 54 contacts → | ||||
Exact match “At Humanifi.ai, we're driving the synergy between humans and AI across industries.” Recorded in the RevenueBase company graph · Nov 5, 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 “text annotation platforms”. 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 392 text annotation platforms worldwide
See the full list, filter by size, metro and specialty, and access 902 tracked professional contacts with verified work emails. Direct dials are available where recorded.
Free signup · no credit card
Text annotation platforms worldwide at a glance
As of Nov 5, 2026Companies by employee count
Email recency is reported on each country list linked below.
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.
- Coverage
- Every country. Country and city lists for text annotation platforms are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “text annotation platforms” 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. 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 902 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 November 5, 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.
Text annotation platforms by location
2 lists · largest firstEvery Text annotation platforms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 “text annotation platforms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many text annotation platforms are there worldwide?
RevenueBase identified 392 company matches for text annotation platforms worldwide as of November 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?
Sigma AI tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most text annotation platforms?
India leads with 118 companies, followed by the United States (54). Every text annotation platforms list by country and city is linked on this page.
Which city has the most text annotation platforms?
Bangalore leads with 18 company records, followed by San Francisco (12) and Nairobi (9).
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 902 professional contacts with verified work emails tracked across these 392 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 November 5, 2026.
Ready to reach these companies? Verified emails and direct dials for all 392 text annotation platforms worldwide. Start with a free account, no credit card.
Download this list →Related lists
Browse the directory
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
Company intelligence · public preview
Top 25 text annotation platforms worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 392 matching company records for text annotation platforms worldwide, with 10,564 tracked contacts and 902 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: November 5, 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 text annotation platforms worldwide
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 |  Sigma AIsigma.aiHQ: Miami, FL, United StatesReported employees: 501-1,000 | Miami, FL, United States | 501-1,000 | Exact match | 954 contacts → |
“With 30+ years of experience in data annotation, we support AI innovators to build smarter AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Tolokatoloka.aiHQ: Amsterdam, NetherlandsReported employees: Not recorded | Amsterdam, Netherlands | Not recorded | Exact match | 783 contacts → |
“Toloka is the global leader in human-powered data solutions for AI development.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Welo Datat.mtrbio.comHQ: United StatesReported employees: 1,001-5,000 | United States | 1,001-5,000 | Exact match | 748 contacts → |
“With 27+ years of experience, Welo Data is the human-centered infrastructure for globally effective AI.” Recorded description excerpt · November 5, 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 | 660 contacts → |
“Productive Playhouse is the execution partner technical program managers trust when scale, compliance, and quality can’t slip.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Superannotatesuperannotate.comHQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 366 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Supahandssupahands.aiHQ: Kuala Lumpur, MalaysiaReported employees: Not recorded | Kuala Lumpur, Malaysia | Not recorded | Exact match | 191 contacts → |
“Supahands provides fully managed data labelling services for machine learning.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Tagfacttagfact.comHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 171 contacts → |
“Welcome to TAGFact, your premier media intelligence and data annotation/labeling solution.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Label Your Datalabelyourdata.comHQ: Wilmington, United StatesReported employees: 201-500 | Wilmington, United States | 201-500 | Exact match | 160 contacts → |
“Label Your Data is a specialist AI training data provider for teams building AI systems in complex environments.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Prosessor.ai Data & Language Servicesprosessor-ai.comHQ: Istanbul, TürkiyeReported employees: Not recorded | Istanbul, Türkiye | Not recorded | Exact match | 123 contacts → |
“Prosessor.AI is a high-grade AI/ML data provider company for a smarter world.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Opentrain AIopentrain.aiHQ: Seattle, WA, United StatesReported employees: Not recorded | Seattle, WA, United States | Not recorded | Exact match | 120 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Tika Datatika-data.comHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 108 contacts → |
“Fueling the AI age.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Humansignalhumansignal.comHQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 106 contacts → |
“HumanSignal enables data science teams to build AI models with their company DNA.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Datamaker GHdatamaker.ioHQ: Accra, GhanaReported employees: 11-50 | Accra, Ghana | 11-50 | Exact match | 105 contacts → |
“Data labeling solutions for artificial intelligence learning Computer Vision Natural language treatment Speech recognition” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Dataeqdataeq.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 103 contacts → |
“DataEQ uses a Crowd of humans to label millions of unstructured data points.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  cvat.aicvat.aiHQ: Wilmington, DE, United StatesReported employees: 11-50 | Wilmington, DE, United States | 11-50 | Exact match | 102 contacts → |
“CVAT (Computer Vision Annotation Tool) is a leading platform for building high-quality visual datasets for vision AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Kognickognic.comHQ: Gothenburg, SwedenReported employees: 51-200 | Gothenburg, Sweden | 51-200 | Exact match | 101 contacts → |
“Kognic provides the most productive annotation platform for autonomy data.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | HQ: Bhiwadi, DE, IndiaReported employees: 51-200 | Bhiwadi, DE, India | 51-200 | Exact match | 73 contacts → |
“Globose Technology Solutions is an AI based data collection and data annotation company specialising in providing high quality training data for machine learning and artificial…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Gfactorsgfactors.co.inHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 71 contacts → |
“With AI and machine learning being evolved as the fastest-growing technologies that offer incredible innovations that benefit various sectors of the global economy, Annotations &…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  AIMMOaimmo.aiHQ: 성남시, South KoreaReported employees: 51-200 | 성남시, South Korea | 51-200 | Exact match | 71 contacts → |
“AIMMO creates a large volume of training data accurately and quickly so that more industries and enterprises can utilize AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  centaur.aicentaur.aiHQ: Boston, MA, United StatesReported employees: 51-200 | Boston, MA, United States | 51-200 | Exact match | 62 contacts → |
“Centaur.ai data empowers you to build and deploy high-stakes AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Frinksyn AIfrinksyn.comHQ: Kolkata, IndiaReported employees: 51-200 | Kolkata, India | 51-200 | Exact match | 60 contacts → |
“Frinksyn which is situated in West Bengal, India, where we provide workforce support for AI/Machine Learning Data Annotation and Content Moderation services, Having business…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Sakhsham Knowledge Servicessakhsham.comHQ: Lucknow, IndiaReported employees: 51-200 | Lucknow, India | 51-200 | Exact match | 56 contacts → |
“Sakhsham Knowledge Services provides human-in-the-loop, plug-and-play process support services.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Keymakr Data Labelingkeymakr.comHQ: New York, United StatesReported employees: 501-1,000 | New York, 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Alegionalegion.comHQ: Austin, TX, United StatesReported employees: 51-200 | Austin, TX, United States | 51-200 | Exact match | 54 contacts → |
“Alegion has the most powerful and flexible annotation platform for training data in market.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  humanifi.aihumanifi.aiHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 54 contacts → |
“At Humanifi.ai, we're driving the synergy between humans and AI across industries.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 392 company matches
Build a targeted audience, find relevant contacts and export available records to your workflow.
Free signup · 500 credits · limited free results
Text annotation platforms: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
392 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.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 392 companies.
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.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
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: November 5, 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 ↗
Text annotation platforms by location
2 lists · largest firstEvery Text annotation platforms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for text annotation platforms?
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 text annotation platforms did RevenueBase find worldwide?
The saved snapshot records 392 matching company records, 10,564 tracked contacts and 902 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: November 5, 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
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 text annotation platforms worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/text-annotation-platforms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 text annotation platforms worldwide
RevenueBase records 392 matching company records for text annotation platforms worldwide, with 10,564 tracked contacts and 902 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: November 5, 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 text annotation platforms worldwide
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 | Sigma AIsigma.ai HQ: Miami, FL, United StatesReported employees: 501-1,000 | Miami, FL, United States | 501-1,000 | Exact match | 954 contacts → |
“With 30+ years of experience in data annotation, we support AI innovators to build smarter AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Tolokatoloka.ai HQ: Amsterdam, NetherlandsReported employees: Not recorded | Amsterdam, Netherlands | Not recorded | Exact match | 783 contacts → |
“Toloka is the global leader in human-powered data solutions for AI development.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Welo Datat.mtrbio.com HQ: United StatesReported employees: 1,001-5,000 | United States | 1,001-5,000 | Exact match | 748 contacts → |
“With 27+ years of experience, Welo Data is the human-centered infrastructure for globally effective AI.” Recorded description excerpt · November 5, 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 | 660 contacts → |
“Productive Playhouse is the execution partner technical program managers trust when scale, compliance, and quality can’t slip.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Superannotatesuperannotate.com HQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 366 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Supahandssupahands.ai HQ: Kuala Lumpur, MalaysiaReported employees: Not recorded | Kuala Lumpur, Malaysia | Not recorded | Exact match | 191 contacts → |
“Supahands provides fully managed data labelling services for machine learning.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Tagfacttagfact.com HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 171 contacts → |
“Welcome to TAGFact, your premier media intelligence and data annotation/labeling solution.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Label Your Datalabelyourdata.com HQ: Wilmington, United StatesReported employees: 201-500 | Wilmington, United States | 201-500 | Exact match | 160 contacts → |
“Label Your Data is a specialist AI training data provider for teams building AI systems in complex environments.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Prosessor.ai Data & Language Servicesprosessor-ai.com HQ: Istanbul, TürkiyeReported employees: Not recorded | Istanbul, Türkiye | Not recorded | Exact match | 123 contacts → |
“Prosessor.AI is a high-grade AI/ML data provider company for a smarter world.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Opentrain AIopentrain.ai HQ: Seattle, WA, United StatesReported employees: Not recorded | Seattle, WA, United States | Not recorded | Exact match | 120 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Tika Datatika-data.com HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 108 contacts → |
“Fueling the AI age.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Humansignalhumansignal.com HQ: San Francisco, CA, United StatesReported employees: 51-200 | San Francisco, CA, United States | 51-200 | Exact match | 106 contacts → |
“HumanSignal enables data science teams to build AI models with their company DNA.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Datamaker GHdatamaker.io HQ: Accra, GhanaReported employees: 11-50 | Accra, Ghana | 11-50 | Exact match | 105 contacts → |
“Data labeling solutions for artificial intelligence learning Computer Vision Natural language treatment Speech recognition” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Dataeqdataeq.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 103 contacts → |
“DataEQ uses a Crowd of humans to label millions of unstructured data points.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | cvat.aicvat.ai HQ: Wilmington, DE, United StatesReported employees: 11-50 | Wilmington, DE, United States | 11-50 | Exact match | 102 contacts → |
“CVAT (Computer Vision Annotation Tool) is a leading platform for building high-quality visual datasets for vision AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Kognickognic.com HQ: Gothenburg, SwedenReported employees: 51-200 | Gothenburg, Sweden | 51-200 | Exact match | 101 contacts → |
“Kognic provides the most productive annotation platform for autonomy data.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | HQ: Bhiwadi, DE, IndiaReported employees: 51-200 | Bhiwadi, DE, India | 51-200 | Exact match | 73 contacts → |
“Globose Technology Solutions is an AI based data collection and data annotation company specialising in providing high quality training data for machine learning and artificial…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Gfactorsgfactors.co.in HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 71 contacts → |
“With AI and machine learning being evolved as the fastest-growing technologies that offer incredible innovations that benefit various sectors of the global economy, Annotations &…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | AIMMOaimmo.ai HQ: 성남시, South KoreaReported employees: 51-200 | 성남시, South Korea | 51-200 | Exact match | 71 contacts → |
“AIMMO creates a large volume of training data accurately and quickly so that more industries and enterprises can utilize AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | centaur.aicentaur.ai HQ: Boston, MA, United StatesReported employees: 51-200 | Boston, MA, United States | 51-200 | Exact match | 62 contacts → |
“Centaur.ai data empowers you to build and deploy high-stakes AI.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Frinksyn AIfrinksyn.com HQ: Kolkata, IndiaReported employees: 51-200 | Kolkata, India | 51-200 | Exact match | 60 contacts → |
“Frinksyn which is situated in West Bengal, India, where we provide workforce support for AI/Machine Learning Data Annotation and Content Moderation services, Having business…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Sakhsham Knowledge Servicessakhsham.com HQ: Lucknow, IndiaReported employees: 51-200 | Lucknow, India | 51-200 | Exact match | 56 contacts → |
“Sakhsham Knowledge Services provides human-in-the-loop, plug-and-play process support services.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Keymakr Data Labelingkeymakr.com HQ: New York, United StatesReported employees: 501-1,000 | New York, 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Alegionalegion.com HQ: Austin, TX, United StatesReported employees: 51-200 | Austin, TX, United States | 51-200 | Exact match | 54 contacts → |
“Alegion has the most powerful and flexible annotation platform for training data in market.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | humanifi.aihumanifi.ai HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 54 contacts → |
“At Humanifi.ai, we're driving the synergy between humans and AI across industries.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 392 company matches
Build a targeted audience, find relevant contacts and export available records to your workflow.
Free signup · 500 credits · limited free results
Text annotation platforms: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
392 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.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 392 companies.
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.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
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: November 5, 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 ↗
Text annotation platforms by location
2 lists · largest firstEvery Text annotation platforms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for text annotation platforms?
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 text annotation platforms did RevenueBase find worldwide?
The saved snapshot records 392 matching company records, 10,564 tracked contacts and 902 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: November 5, 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
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 text annotation platforms worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/text-annotation-platforms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗