Company lists · Data verified August 2026

Top 25 Asynchronous communication software companies based in the United States

Name: Asynchronous communication software companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 153 companies tracked

There are 153 asynchronous communication software companies headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 4,909 professional contacts across them, including 214 with verified work emails and 1,498 with mobile numbers. San Francisco is the largest hub.

This list covers asynchronous communication software companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

153Companies

4,909Contacts tracked

214Verified emails

1,498Mobile numbers

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The 25 largest asynchronous communication software companies based in the United States

Ranked by team size

Top 25 of 153 asynchronous communication software companies based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	SLACK	San Francisco, CA	1,001-5,000	2,591	4
2	Anywhereworks	Raleigh, NC	1,001-5,000	1,100	38
3	Invision	New York, NY	501-1,000	166	1
4	LOOM	San Francisco, CA	51-200	143	40
5	NIFTY	New York, NY	11-50	91	1
6	SWIT	San Francisco, CA	51-200	63	2
7	Gather	n/a	11-50	58	17
8	Sowork	Boston, MA	11-50	24	7
9	Parabol	Alhambra, CA	11-50	20	11
10	Threads	San Francisco, CA	11-50	16	1
11	Kandra Labs, Inc. Creators Of Zulip	San Francisco, CA	11-50	15	9
12	PIBOX	Los Angeles, CA	11-50	15	6
13	Kumospace	New York, NY	11-50	15	1
14	Optevo	Denver, CO	11-50	14	5
15	Almanac	San Francisco, CA	11-50	14	1
16	Genuitec, LLC	Flower Mound, TX	11-50	13	8
17	Coolfire	St. Louis, MO	51-200	11	2
18	Intentional Software Corporation	Bellevue, WA	51-200	9	1
19	Kavi Corporation	Portland, OR	11-50	9	1
20	Frameable, INC	New York, NY	11-50	8	5
21	Brikit	Portland, OR	11-50	8	2
22	RANGE	San Francisco, CA	11-50	8	1
23	Repticity	New York	51-200	7	3
24	Brosix	Wilmington, DE	11-50	6	2
25	Switchboard	n/a	11-50	6	1

Showing 25 of 153 asynchronous communication software companies based in the United States

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Asynchronous communication software companies based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

San FranciscoLargest hub · 28 HQs

1,498Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Asynchronous communication software companies by metro

Metro	Companies
Asynchronous communication software companies in San Francisco	28
Asynchronous communication software companies in New York	11
Asynchronous communication software companies in Austin	5
Asynchronous communication software companies in Los Angeles	5
Asynchronous communication software companies in Wilmington	4
Asynchronous communication software companies in Irvine	3
Asynchronous communication software companies in Boston	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “asynchronous communication software companies”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 1 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many asynchronous communication software companies are there based in the United States?

There are 153 asynchronous communication software companies headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

SLACK, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most asynchronous communication software companies?

San Francisco leads with 28 headquartered companies, followed by New York (11) and Austin (5).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 214 verified decision-maker contacts tracked across these 153 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.