Company lists · Data refreshed September 2026

Top 25 Custom accounting software developers based in the United States

Name: Custom accounting software developers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 173 companies tracked

RevenueBase identified 173 custom accounting software developers headquartered in the United States as of September 2026 and tracks 1,005 professional contacts across them, including 324 with verified work emails. Los Angeles is the largest hub.

This list covers custom accounting software developers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

173Companies

1,005Contacts tracked

324Verified emails

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The 25 largest custom accounting software developers based in the United States

Ranked by team size

Top 25 of 173 custom accounting software developers based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to custom accounting software developers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	BCS Prosoft	Strong evidence	San Antonio, TX, United StatesHQ checked Sep 28, 2026	11-50	57 contacts →
	Strong evidence “BCS ProSoft is a leading provider of accounting and ERP business management software.” Source: RevenueBase Database · checked Sep 28, 2026
2	Accountmate Software Corporation	Strong evidence	Petaluma, CA, United StatesHQ checked Sep 28, 2026	11-50	47 contacts →
	Strong evidence “AccountMate Software Corporation Founded in 1984, AccountMate develops and markets fully modifiable business accounting software.” Source: RevenueBase Database · checked Sep 28, 2026
3	Cougar Mountain Software	Strong evidence	Boise, ID, United StatesHQ checked Sep 28, 2026	11-50	42 contacts →
	Strong evidence “Founded in 1982, Cougar Mountain Software provides business accounting software and hardware solutions for more than retail, wholesale, nonprofit and service based businesses…” Source: RevenueBase Database · checked Sep 28, 2026
4	Accountingware	Strong evidence	Lubbock, TX, United StatesHQ checked Sep 28, 2026	51-200	37 contacts →
	Strong evidence “AccountingWare is the developer of ActivityHD, a flexible and comprehensive ERP system allowing the sophisticated accounting department to manage the enterprise.” Source: RevenueBase Database · checked Sep 28, 2026
5	Florida Business Software Solutions LLC	Strong evidence	Clearwater, FL, United StatesHQ checked Sep 28, 2026	1-10	30 contacts →
	Strong evidence “FLBSS is a regional business software and consulting company that provides trusted solutions to small and medium sized businesses who have outgrown their accounting and business…” Source: RevenueBase Database · checked Sep 28, 2026
6	Passport Software, INC	Strong evidence	Northfield, IL, United StatesHQ checked Sep 28, 2026	11-50	27 contacts →
	Strong evidence “Passport Software develops comprehensive business and accounting software in the small and medium-sized business markets.” Source: RevenueBase Database · checked Sep 28, 2026
7	KICK	Strong evidence	Palo Alto, CA, United StatesHQ checked Sep 28, 2026	11-50	26 contacts →
	Strong evidence “Kick is accounting software that does the work for you.” Source: RevenueBase Database · checked Sep 28, 2026
8	RED Wing Software	Strong evidence	Red Wing, MN, United StatesHQ checked Sep 28, 2026	11-50	25 contacts →
	Strong evidence “Red Wing Software develops and supports accounting, payroll, and financial management software for small-to-mid-sized businesses, agribusinesses, nonprofits, and municipals across…” Source: RevenueBase Database · checked Sep 28, 2026
9	Back Office LLC	Strong evidence	West Des Moines, IA, United StatesHQ checked Sep 28, 2026	11-50	25 contacts →
	Strong evidence “The Back Office is a team of accounting, development, and administrative professionals that have been providing seamless accounting integration software and data conversion…” Source: RevenueBase Database · checked Sep 28, 2026
10	Accountaxpert	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	22 contacts →
	Indirect evidence “Beyond Numbers.” Source: RevenueBase Database · checked Sep 28, 2026
11	SGA Software	Strong evidence	Ebensburg, PA, United StatesHQ checked Sep 28, 2026	11-50	21 contacts →
	Strong evidence “Stock, Garber, and Associates, Inc.(SGA) is a software development company that specializes in financial software, such as Fund and Corporate Accounting, and related SGA Pulse…” Source: RevenueBase Database · checked Sep 28, 2026
12	Crystal Computer Consulting	Strong evidence	Janesville, WI, United StatesHQ checked Sep 28, 2026	11-50	19 contacts →
	Strong evidence “Crystal Computer Consulting was founding in 1990, with the original mission to build customized business management and accounting packages for small to medium businesses.” Source: RevenueBase Database · checked Sep 28, 2026
13	Biz-Tech Services, INC	Strong evidence	Glendale, CA, United StatesHQ checked Sep 28, 2026	11-50	18 contacts →
	Strong evidence “Biz-Tech Services is a strategic software solution provider offering complete end-to-end accounting, distribution, manufacturing customer relationship management software…” Source: RevenueBase Database · checked Sep 28, 2026
14	Procas, LLC	Strong evidence	Columbia, MD, United StatesHQ checked Sep 28, 2026	11-50	16 contacts →
	Strong evidence “PROCAS Accounting Software for Government Contractors.” Source: RevenueBase Database · checked Sep 28, 2026
15	Outsourced Accounting Services, LLC	Partial evidence	Port Charlotte, OR, United StatesHQ checked Sep 28, 2026	11-50	15 contacts →
	Partial evidence “Outsourced Accounting Services provides client-focused services to address all of your firms accounting needs.” Source: RevenueBase Database · checked Sep 28, 2026
16	Equation Technologies, INC	Indirect evidence	Encinitas, CA, United StatesHQ checked Sep 28, 2026	11-50	14 contacts →
	Indirect evidence “Equation Technologies provides business management solutions to small and mid-sized companies.” Source: RevenueBase Database · checked Sep 28, 2026
17	Finoptimal	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	11-50	12 contacts →
	Partial evidence “We build apps for our accounting firm to close the books continuously, and now you can use those apps too.” Source: RevenueBase Database · checked Sep 28, 2026
18	Marketplace Software	Partial evidence	Honolulu, HI, United StatesHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “Meet e-manage\|ONE, the brainchild of Marketplace Software, a comprehensive business management solution engineered to streamline and optimize a wide spectrum of operational…” Source: RevenueBase Database · checked Sep 28, 2026
19	Avise INC	Strong evidence	New York, United StatesHQ checked Sep 28, 2026	11-50	11 contacts →
	Strong evidence “Avise is modern accounting software that solves for QuickBooks limitations, that accountants love using, and that businesses can scale on (avoiding an ERP implementation).” Source: RevenueBase Database · checked Sep 28, 2026
20	Softledger	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “SoftLedger is a general ledger for organizations that have outgrown QuickBooks and don't want the overhead of legacy enterprise software.” Source: RevenueBase Database · checked Sep 28, 2026
21	Twinpeaks Online	Strong evidence	Pasadena, CA, United StatesHQ checked Sep 28, 2026	1-10	10 contacts →
	Strong evidence “TwinPeaks Online provides software and web based management and accounting applications to businesses all over the world.” Source: RevenueBase Database · checked Sep 28, 2026
22	Landfall Solutions	Partial evidence	Wheaton, IL, United StatesHQ checked Sep 28, 2026	11-50	9 contacts →
	Partial evidence “LANDFALL Solutions provides accounting and business technology solutions for small to mid-sized companies.” Source: RevenueBase Database · checked Sep 28, 2026
23	Xcellerated Solutions LLC	Strong evidence	Kaysville, UT, United StatesHQ checked Sep 28, 2026	11-50	9 contacts →
	Strong evidence “Xcellerated Solutions LLC (XS) is a Utah-based company that specializes in helping Small-to-Medium sized businesses (SMB) with software for their accounting, inventory, warehouse…” Source: RevenueBase Database · checked Sep 28, 2026
24	Fund EZ	Strong evidence	White Plains, NY, United StatesHQ checked Sep 28, 2026	11-50	8 contacts →
	Strong evidence “For over 25 years, the Fund EZ team has simplified accounting for nonprofits by delivering high-quality software, support and dedicating ourselves to client satisfaction.” Source: RevenueBase Database · checked Sep 28, 2026
25	Archarina	Indirect evidence	Cumming, GA, United StatesHQ checked Sep 28, 2026	51-200	8 contacts →
	Indirect evidence “Small and large organizations alike face similar business challenges.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: custom accounting software developers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names custom accounting software developers.
Partial evidence: Its own public description names part of custom accounting software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom accounting software developers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 173 custom accounting software developers based in the United States

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Custom accounting software developers based in the United States at a glance

As of Sep 28, 2026

32.2%Verified-email coverage

5.8Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · Los Angeles

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

104

11-50

51-200

201-500

1,001-5,000

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 173 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among custom accounting software developers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “custom accounting software developers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names custom accounting software developers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among custom accounting software developers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 324 across the full list. 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 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names custom accounting software developers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many custom accounting software developers are there based in the United States?

RevenueBase identified 173 custom accounting software developers headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

BCS Prosoft, headquartered in San Antonio, tops this list with the largest team on record.

Which city has the most custom accounting software developers?

Los Angeles leads with 6 headquartered companies, followed by Houston (5) and New York (4).

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 324 verified decision-maker contacts tracked across these 173 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 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 Smart Search, 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.