Company lists · Data refreshed September 2026

Top 25 Calendar scheduling software companies based in the United States

RevenueBase identified 161 company matches for calendar scheduling software companies associated with the United States as of September 2026 and tracks 1,518 professional contacts across them, including 521 with verified work emails. San Francisco is the largest hub.

This list covers company matches for calendar scheduling software 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 27, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 27, 2026 How this list was built
161Companies
1,518Contacts tracked
521Verified emails
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The 25 largest calendar scheduling software companies based in the United States

Ranked by team size
Top 25 of 161 company matches for calendar scheduling software companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 27, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchAtlanta, GA, United StatesHQ recorded Sep 27, 2026501-1,000507 contacts →

Exact match

“At Calendly, our vision is to take the work out of connecting with others so you can accomplish more.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
2Exact matchRemote First, VA, United StatesHQ recorded Sep 27, 202611-5064 contacts →

Exact match

“We’re on a mission to make the most of every minute, with scheduling that’s built to help reshape what’s possible for our schools, and each student within them.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
3Exact matchAtlanta, GA, United StatesHQ recorded Sep 27, 202651-20057 contacts →

Exact match

“SUMO is a customer engagement platform that includes online Appointment, Event, and Field Sales scheduling, built fully native on Salesforce.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
4Exact matchSan Francisco, CA, United StatesHQ recorded Sep 27, 202611-5046 contacts →

Exact match

“Cal.com is a modern, fully customizable scheduling platform built for teams that care about both power and design.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
5Exact matchSeattle, WA, United StatesHQ recorded Sep 27, 202651-20045 contacts →

Exact match

“Shiftboard is a leading provider of employee scheduling software for shift-based operations in mission-critical industries.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
6Exact matchSan Francisco, CA, United StatesHQ recorded Sep 27, 202651-20037 contacts →

Exact match

“Clockwise is an AI-powered calendar assistant that builds smarter schedules for everyone by coordinating the way individuals, teams, and companies prefer to work.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
7Exact matchAustin, TX, United StatesHQ recorded Sep 27, 202611-5031 contacts →

Exact match

“Picktime is one of the world's leading scheduling platforms providing a quick, intuitive tool that enables professionals to book meetings with clients.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
8Exact matchSalt Lake City, UT, United StatesHQ recorded Sep 27, 202651-20030 contacts →

Exact match

“Company Info History In 1984, the first Franklin Day Planner was produced, followed by a popular time management workshop.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
9Exact matchWilmington, DE, United StatesHQ recorded Sep 27, 202611-5029 contacts →

Exact match

“TimeZest is the dispatch company for managed service providers.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
10Exact matchPortland, OR, United StatesHQ recorded Sep 27, 202651-20022 contacts →

Exact match

“Setmore offers a free online scheduling platform that empowers you to balance your scheduling, connect with customers, and grow your brand.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
11Exact matchNew York, United StatesHQ recorded Sep 27, 202611-5019 contacts →

Exact match

“Vimcal is the world's fastest calendar, beautifully designed for people who have too many meetings.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
12Exact matchSan Francisco, CA, United StatesHQ recorded Sep 27, 202611-5018 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 · Sep 27, 2026 · View company records in RevenueBase
13Exact matchPortland, OR, United StatesHQ recorded Sep 27, 202611-5017 contacts →

Exact match

“The important stuff doesn't happen just because you write it down.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
14Exact matchSan Antonio, TX, United StatesHQ recorded Sep 27, 202611-5014 contacts →

Exact match

“It’s About Time… Time is more than money In your 24x7 organization, time is everything.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
15Exact matchCollege Station, TX, United StatesHQ recorded Sep 27, 20261-1014 contacts →

Exact match

“Optisol is a software company located in Texas.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
16Exact matchKnoxville, TN, United StatesHQ recorded Sep 27, 202611-5013 contacts →

Exact match

“The trusted partner in comprehensive B2B appointment, event, and association management software, building enduring partnerships with our clients to empower them to create…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
17Exact matchGrand Rapids, MI, United StatesHQ recorded Sep 27, 202611-5012 contacts →

Exact match

“SCHEDULING The heart of SKED is the amazing control and flexibility of your scheduling.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
18Exact matchCharlotte, NC, United StatesHQ recorded Sep 27, 20261-1011 contacts →

Exact match

“TimeTap Online Scheduling is a simple & effective tool for the multifaceted and over-stressed life of service providers & appointment based businesses.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
19Exact matchSpokane, WA, United StatesHQ recorded Sep 27, 202611-5011 contacts →

Exact match

“We are Calendar, trying to make the world a much more productive place.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
20Exact matchNew York, NY, United StatesHQ recorded Sep 27, 20261,001-5,00011 contacts →

Exact match

“Flexible scheduling software designed to help you grow, because booking time should never get in the way of success.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
21Exact matchSan Francisco, CA, United StatesHQ recorded Sep 27, 20261-109 contacts →

Exact match

“Every scheduling tool books by availability, whoever grabs the open slot wins.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
22Exact matchFargo, ND, United StatesHQ recorded Sep 27, 202611-509 contacts →

Exact match

“Atlas Business Solutions, Inc.(ABS) develops easy and affordable software for small businesses that help them save time and streamline business processes.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
23Exact matchAventura, United StatesHQ recorded Sep 27, 202611-509 contacts →

Exact match

“Shifton is a multi-functional online solution which ensures stable workflow within a company.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
24Exact matchTampa, FL, United StatesHQ recorded Sep 27, 202651-2007 contacts →

Exact match

“Our History We started our construction company 18 years ago, specializing in concrete and masonry.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
25Exact matchScottsdale, AZ, United StatesHQ recorded Sep 27, 202651-2006 contacts →

Exact match

“StormSource Software, which does business as AppointmentPlus, is a worldwide leader in online scheduling solutions for growing businesses, enterprises, higher education…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase

Showing 25 of 161 calendar scheduling software companies based in the United States

See the full list, filter by size, metro and specialty, and access 521 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Calendar scheduling software companies based in the United States at a glance

As of Sep 27, 2026
34.3%Verified-email coverage
9.4Average contacts per company
1-10Median size (employees)
9.9%Largest-city concentration · San Francisco
Sep 27, 2026Page data refreshed

Companies by employee count

1-10
106
11-50
40
51-200
10
201-500
2
501-1,000
2
1,001-5,000
1

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 161 companies.

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 “calendar scheduling software 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 521 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 27, 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 “calendar scheduling software companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many calendar scheduling software companies are there based in the United States?

RevenueBase identified 161 company matches for calendar scheduling software 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?

Calendly tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most calendar scheduling software companies?

San Francisco leads with 16 company records, followed by New York (12) and Austin (7).

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 521 professional contacts with verified work emails tracked across these 161 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 27, 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.