Company lists · Data refreshed October 2026
Top 25 E-mailing and calendaring software as a service companies worldwide
RevenueBase identified 368 company matches for e-mailing and calendaring software as a service companies worldwide as of October 2026 and tracks 6,233 professional contacts across them, including 235 with verified work emails. The United States is the largest market and Mumbai the largest hub.
This list covers company matches for e-mailing and calendaring software as a service companies 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 October 19, 2026. Country and city lists for e-mailing and calendaring software as a service companies 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 e-mailing and calendaring software as a service companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 542 contacts → | ||||
Exact match “With our strong brands GMX, WEB.DE and mail.com and over 43 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 2 | 296 contacts → | ||||
Exact match “Fastmail is email, just better!” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 3 | 174 contacts → | ||||
Exact match “Lark is a new take on the office suite that is transforming workplace collaboration.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 4 | 157 contacts → | ||||
Exact match “Titan is an email suite built specifically for professionals and small businesses.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 5 | 129 contacts → | ||||
Exact match “Prezados clientes e amigos.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 6 | 97 contacts → | ||||
Exact match “Hundreds of thousands of developers around the world use Nylas to increase velocity and seamlessly build customizable email and scheduling capabilities through state-of-the-art…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 7 | 53 contacts → | ||||
Exact match “Business Email Accounts, Calendaring, Contacts and Collaboration Services for Your Business from BlueTie.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 8 | 35 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 9 | 33 contacts → | ||||
Exact match “Flo is a productivity, collaboration and project management tool that combines email, calendars, notes, tasks, contacts, calls, chat, and team workspaces in a unique way that…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 10 | 24 contacts → | ||||
Exact match “Email was never meant to be this busy.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 11 | 22 contacts → | ||||
Exact match “INVIDIA brings secure enterprise grade and competitive Cloud services to small businesses through strong international technology partnerships.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 12 | 18 contacts → | ||||
Exact match “AddEvent is a cutting-edge software company providing best-in-class calendar marketing and event management solutions to thousands of companies worldwide.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 13 | 18 contacts → | ||||
Exact match “Mailbutler is the leading email productivity extension for Microsoft Outlook, Apple Mail and Gmail that makes your inbox smarter.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 14 | 17 contacts → | ||||
Exact match “You spend 3 hours a day in your inbox.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 15 | 16 contacts → | ||||
Exact match “Boomerang is the leader in thoughtful email productivity software that empowers people to focus on what matters on the world’s top email platforms.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 16 | 14 contacts → | ||||
Exact match “Reliable and Secure email hosting services for SMB and Enterprise.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 17 | 12 contacts → | ||||
Exact match “Mail2World designs, delivers and supports a technology-leading and award-winning suite of carrier-class, Web-based email messaging and collaboration services.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 18 | 12 contacts → | ||||
Exact match “Yukthi Systems is a Bangalore based company, providing industry leading email services.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 19 | 11 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 20 | 11 contacts → | ||||
Exact match “We are Calendar, trying to make the world a much more productive place.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 21 | 11 contacts → | ||||
Exact match “Leading provider of email continuity, archiving, e-discovery, security and notification services delivered using SaaS model.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 22 | 10 contacts → | ||||
Exact match “Match My Email allows you to sync your emails and calendars automatically with Salesforce.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 23 | 8 contacts → | ||||
Exact match “Down-to earth Cloud services.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 24 | 8 contacts → | ||||
Exact match “Do you want to make the most of your time?⌛ We made you over 60 free productivity tools for Gmail.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 25 | 8 contacts → | ||||
Exact match “SDFE GmbH is based in Hürtgenwald, Germany and puts its focus on scheduling Software for all requirements of a Company.” Recorded in the RevenueBase company graph · Oct 19, 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 “e-mailing and calendaring software as a service 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 368 e-mailing and calendaring software as a service companies worldwide
See the full list, filter by size, metro and specialty, and access 235 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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E-mailing and calendaring software as a service companies worldwide at a glance
As of Oct 19, 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 e-mailing and calendaring software as a service companies are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “e-mailing and calendaring software as a service 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. 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 235 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 October 19, 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.
E-mailing and calendaring software as a service companies by location
1 lists · largest firstEvery E-mailing and calendaring software as a service companies 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 “e-mailing and calendaring software as a service companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many e-mailing and calendaring software as a service companies are there worldwide?
RevenueBase identified 368 company matches for e-mailing and calendaring software as a service companies worldwide as of October 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?
Gmx, Web.De & Mail.com tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most e-mailing and calendaring software as a service companies?
The United States leads with 66 companies. Every e-mailing and calendaring software as a service companies list by country and city is linked on this page.
Which city has the most e-mailing and calendaring software as a service companies?
Mumbai leads with 6 company records, followed by San Francisco (6) and Chennai (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 235 professional contacts with verified work emails tracked across these 368 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 October 19, 2026.
Ready to reach these companies? Verified emails and direct dials for all 368 e-mailing and calendaring software as a service companies worldwide. Start with a free account, no credit card.
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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
Company intelligence · public preview
Top 25 e-mailing and calendaring software as a service companies worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 368 matching company records for e-mailing and calendaring software as a service companies worldwide, with 6,233 tracked contacts and 235 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: October 19, 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 e-mailing and calendaring software as a service companies 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 | Gmx, Web.De & Mail.commail-and-media.com HQ: Karlsruhe, GermanyReported employees: 501-1,000 | Karlsruhe, Germany | 501-1,000 | Exact match | 542 contacts → |
“With our strong brands GMX, WEB.DE and mail.com and over 43 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Fastmailfastmail.com HQ: Melbourne, AustraliaReported employees: Not recorded | Melbourne, Australia | Not recorded | Exact match | 296 contacts → |
“Fastmail is email, just better!” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  LARKlarksuite.comHQ: SingaporeReported employees: 1,001-5,000 | Singapore | 1,001-5,000 | Exact match | 174 contacts → |
“Lark is a new take on the office suite that is transforming workplace collaboration.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Titan Emailtitan.emailHQ: Mumbai, IndiaReported employees: 51-200 | Mumbai, India | 51-200 | Exact match | 157 contacts → |
“Titan is an email suite built specifically for professionals and small businesses.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Infolinkinfolink.com.brHQ: Rio De Janeiro, BrazilReported employees: Not recorded | Rio De Janeiro, Brazil | Not recorded | Exact match | 129 contacts → |
“Prezados clientes e amigos.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  NYLASnylas.comHQ: San Francisco, CA, United StatesReported employees: 201-500 | San Francisco, CA, United States | 201-500 | Exact match | 97 contacts → |
“Hundreds of thousands of developers around the world use Nylas to increase velocity and seamlessly build customizable email and scheduling capabilities through state-of-the-art…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Bluetie, INCbluetie.comHQ: Rochester, NY, United StatesReported employees: 11-50 | Rochester, NY, United States | 11-50 | Exact match | 53 contacts → |
“Business Email Accounts, Calendaring, Contacts and Collaboration Services for Your Business from BlueTie.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | HQ: IndiaReported employees: 11-50 | India | 11-50 | Exact match | 35 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 9 | Floware LLCfloware.com HQ: Seattle, United StatesReported employees: 51-200 | Seattle, United States | 51-200 | Exact match | 33 contacts → |
“Flo is a productivity, collaboration and project management tool that combines email, calendars, notes, tasks, contacts, calls, chat, and team workspaces in a unique way that…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Canary Mailcanarymail.io HQ: San Francisco, United StatesReported employees: 11-50 | San Francisco, United States | 11-50 | Exact match | 24 contacts → |
“Email was never meant to be this busy.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Invidiainvidia.com.auHQ: Canberra, AustraliaReported employees: 51-200 | Canberra, Australia | 51-200 | Exact match | 22 contacts → |
“INVIDIA brings secure enterprise grade and competitive Cloud services to small businesses through strong international technology partnerships.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Addeventaddevent.comHQ: San Francisco, CA, United StatesReported employees: 11-50 | San Francisco, CA, United States | 11-50 | Exact match | 18 contacts → |
“AddEvent is a cutting-edge software company providing best-in-class calendar marketing and event management solutions to thousands of companies worldwide.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Mailbutlermailbutler.ioHQ: Berlin, GermanyReported employees: 11-50 | Berlin, Germany | 11-50 | Exact match | 18 contacts → |
“Mailbutler is the leading email productivity extension for Microsoft Outlook, Apple Mail and Gmail that makes your inbox smarter.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Gmeliusgmelius.comHQ: Geneva, SwitzerlandReported employees: 11-50 | Geneva, Switzerland | 11-50 | Exact match | 17 contacts → |
“You spend 3 hours a day in your inbox.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Boomerangboomerangapp.comHQ: Mountain View, CA, United StatesReported employees: 11-50 | Mountain View, CA, United States | 11-50 | Exact match | 16 contacts → |
“Boomerang is the leader in thoughtful email productivity software that empowers people to focus on what matters on the world’s top email platforms.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Duocircleduocircle.comHQ: San Diego, CA, United StatesReported employees: 11-50 | San Diego, CA, United States | 11-50 | Exact match | 14 contacts → |
“Reliable and Secure email hosting services for SMB and Enterprise.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Mail2world, INCmail2world.netHQ: Los Angeles, CA, United StatesReported employees: 51-200 | Los Angeles, CA, United States | 51-200 | Exact match | 12 contacts → |
“Mail2World designs, delivers and supports a technology-leading and award-winning suite of carrier-class, Web-based email messaging and collaboration services.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Yukthi Systems Private Limitedyukthi.comHQ: Bangalore, IndiaReported employees: 11-50 | Bangalore, India | 11-50 | Exact match | 12 contacts → |
“Yukthi Systems is a Bangalore based company, providing industry leading email services.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  E.M. Technologies India Pvt. LTDemtindia.comHQ: Ghaziabad, IndiaReported employees: 11-50 | Ghaziabad, India | 11-50 | Exact match | 11 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 20 |  Calendarcalendar.comHQ: Spokane, WA, United StatesReported employees: 11-50 | Spokane, WA, United States | 11-50 | Exact match | 11 contacts → |
“We are Calendar, trying to make the world a much more productive place.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Messageonemessageone.com HQ: United StatesReported employees: 51-200 | United States | 51-200 | Exact match | 11 contacts → |
“Leading provider of email continuity, archiving, e-discovery, security and notification services delivered using SaaS model.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Match MY Emailmatchmyemail.comHQ: Ardsley On Hudson, NY, United StatesReported employees: 1-10 | Ardsley On Hudson, NY, United States | 1-10 | Exact match | 10 contacts → |
“Match My Email allows you to sync your emails and calendars automatically with Salesforce.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  ISP Cloud Services INCispcloudservices.comHQ: Miami, FL, United StatesReported employees: 1-10 | Miami, FL, United States | 1-10 | Exact match | 8 contacts → |
“Down-to earth Cloud services.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Cloudhqcloudhq.net HQ: San Francisco, CA, United StatesReported employees: 11-50 | San Francisco, CA, United States | 11-50 | Exact match | 8 contacts → |
“Do you want to make the most of your time?⌛ We made you over 60 free productivity tools for Gmail.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Timeflex Solutionstimeflex.deHQ: Hürtgenwald, GermanyReported employees: 11-50 | Hürtgenwald, Germany | 11-50 | Exact match | 8 contacts → |
“SDFE GmbH is based in Hürtgenwald, Germany and puts its focus on scheduling Software for all requirements of a Company.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 368 company matches
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E-mailing and calendaring software as a service companies: dataset insights
October 19, 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
363 records in the displayed employee bands.
5 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 368 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: October 19, 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 ↗
E-mailing and calendaring software as a service companies by location
1 lists · largest firstEvery E-mailing and calendaring software as a service companies 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 e-mailing and calendaring software as a service 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 e-mailing and calendaring software as a service companies did RevenueBase find worldwide?
The saved snapshot records 368 matching company records, 6,233 tracked contacts and 235 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: October 19, 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 e-mailing and calendaring software as a service companies worldwide. Snapshot: October 19, 2026. https://revenuebase.ai/companies/browse/e-mailing-and-calendaring-software-as-a-service-companies.
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 e-mailing and calendaring software as a service companies worldwide
RevenueBase records 368 matching company records for e-mailing and calendaring software as a service companies worldwide, with 6,233 tracked contacts and 235 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: October 19, 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 e-mailing and calendaring software as a service companies 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 | Gmx, Web.De & Mail.commail-and-media.com HQ: Karlsruhe, GermanyReported employees: 501-1,000 | Karlsruhe, Germany | 501-1,000 | Exact match | 542 contacts → |
“With our strong brands GMX, WEB.DE and mail.com and over 43 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Fastmailfastmail.com HQ: Melbourne, AustraliaReported employees: Not recorded | Melbourne, Australia | Not recorded | Exact match | 296 contacts → |
“Fastmail is email, just better!” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | LARKlarksuite.com HQ: SingaporeReported employees: 1,001-5,000 | Singapore | 1,001-5,000 | Exact match | 174 contacts → |
“Lark is a new take on the office suite that is transforming workplace collaboration.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Titan Emailtitan.email HQ: Mumbai, IndiaReported employees: 51-200 | Mumbai, India | 51-200 | Exact match | 157 contacts → |
“Titan is an email suite built specifically for professionals and small businesses.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Infolinkinfolink.com.br HQ: Rio De Janeiro, BrazilReported employees: Not recorded | Rio De Janeiro, Brazil | Not recorded | Exact match | 129 contacts → |
“Prezados clientes e amigos.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | NYLASnylas.com HQ: San Francisco, CA, United StatesReported employees: 201-500 | San Francisco, CA, United States | 201-500 | Exact match | 97 contacts → |
“Hundreds of thousands of developers around the world use Nylas to increase velocity and seamlessly build customizable email and scheduling capabilities through state-of-the-art…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Bluetie, INCbluetie.com HQ: Rochester, NY, United StatesReported employees: 11-50 | Rochester, NY, United States | 11-50 | Exact match | 53 contacts → |
“Business Email Accounts, Calendaring, Contacts and Collaboration Services for Your Business from BlueTie.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | HQ: IndiaReported employees: 11-50 | India | 11-50 | Exact match | 35 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 9 | Floware LLCfloware.com HQ: Seattle, United StatesReported employees: 51-200 | Seattle, United States | 51-200 | Exact match | 33 contacts → |
“Flo is a productivity, collaboration and project management tool that combines email, calendars, notes, tasks, contacts, calls, chat, and team workspaces in a unique way that…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Canary Mailcanarymail.io HQ: San Francisco, United StatesReported employees: 11-50 | San Francisco, United States | 11-50 | Exact match | 24 contacts → |
“Email was never meant to be this busy.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Invidiainvidia.com.au HQ: Canberra, AustraliaReported employees: 51-200 | Canberra, Australia | 51-200 | Exact match | 22 contacts → |
“INVIDIA brings secure enterprise grade and competitive Cloud services to small businesses through strong international technology partnerships.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Addeventaddevent.com HQ: San Francisco, CA, United StatesReported employees: 11-50 | San Francisco, CA, United States | 11-50 | Exact match | 18 contacts → |
“AddEvent is a cutting-edge software company providing best-in-class calendar marketing and event management solutions to thousands of companies worldwide.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Mailbutlermailbutler.io HQ: Berlin, GermanyReported employees: 11-50 | Berlin, Germany | 11-50 | Exact match | 18 contacts → |
“Mailbutler is the leading email productivity extension for Microsoft Outlook, Apple Mail and Gmail that makes your inbox smarter.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Gmeliusgmelius.com HQ: Geneva, SwitzerlandReported employees: 11-50 | Geneva, Switzerland | 11-50 | Exact match | 17 contacts → |
“You spend 3 hours a day in your inbox.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Boomerangboomerangapp.com HQ: Mountain View, CA, United StatesReported employees: 11-50 | Mountain View, CA, United States | 11-50 | Exact match | 16 contacts → |
“Boomerang is the leader in thoughtful email productivity software that empowers people to focus on what matters on the world’s top email platforms.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Duocircleduocircle.com HQ: San Diego, CA, United StatesReported employees: 11-50 | San Diego, CA, United States | 11-50 | Exact match | 14 contacts → |
“Reliable and Secure email hosting services for SMB and Enterprise.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Mail2world, INCmail2world.net HQ: Los Angeles, CA, United StatesReported employees: 51-200 | Los Angeles, CA, United States | 51-200 | Exact match | 12 contacts → |
“Mail2World designs, delivers and supports a technology-leading and award-winning suite of carrier-class, Web-based email messaging and collaboration services.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Yukthi Systems Private Limitedyukthi.com HQ: Bangalore, IndiaReported employees: 11-50 | Bangalore, India | 11-50 | Exact match | 12 contacts → |
“Yukthi Systems is a Bangalore based company, providing industry leading email services.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | E.M. Technologies India Pvt. LTDemtindia.com HQ: Ghaziabad, IndiaReported employees: 11-50 | Ghaziabad, India | 11-50 | Exact match | 11 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 20 | Calendarcalendar.com HQ: Spokane, WA, United StatesReported employees: 11-50 | Spokane, WA, United States | 11-50 | Exact match | 11 contacts → |
“We are Calendar, trying to make the world a much more productive place.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Messageonemessageone.com HQ: United StatesReported employees: 51-200 | United States | 51-200 | Exact match | 11 contacts → |
“Leading provider of email continuity, archiving, e-discovery, security and notification services delivered using SaaS model.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Match MY Emailmatchmyemail.com HQ: Ardsley On Hudson, NY, United StatesReported employees: 1-10 | Ardsley On Hudson, NY, United States | 1-10 | Exact match | 10 contacts → |
“Match My Email allows you to sync your emails and calendars automatically with Salesforce.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | ISP Cloud Services INCispcloudservices.com HQ: Miami, FL, United StatesReported employees: 1-10 | Miami, FL, United States | 1-10 | Exact match | 8 contacts → |
“Down-to earth Cloud services.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Cloudhqcloudhq.net HQ: San Francisco, CA, United StatesReported employees: 11-50 | San Francisco, CA, United States | 11-50 | Exact match | 8 contacts → |
“Do you want to make the most of your time?⌛ We made you over 60 free productivity tools for Gmail.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Timeflex Solutionstimeflex.de HQ: Hürtgenwald, GermanyReported employees: 11-50 | Hürtgenwald, Germany | 11-50 | Exact match | 8 contacts → |
“SDFE GmbH is based in Hürtgenwald, Germany and puts its focus on scheduling Software for all requirements of a Company.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 368 company matches
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E-mailing and calendaring software as a service companies: dataset insights
October 19, 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
363 records in the displayed employee bands.
5 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 368 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: October 19, 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 ↗
E-mailing and calendaring software as a service companies by location
1 lists · largest firstEvery E-mailing and calendaring software as a service companies 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 e-mailing and calendaring software as a service 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 e-mailing and calendaring software as a service companies did RevenueBase find worldwide?
The saved snapshot records 368 matching company records, 6,233 tracked contacts and 235 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: October 19, 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 e-mailing and calendaring software as a service companies worldwide. Snapshot: October 19, 2026. https://revenuebase.ai/companies/browse/e-mailing-and-calendaring-software-as-a-service-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗