Company lists · Data refreshed September 2026

Top 25 Test consulting firms based in the United States

Name: Test consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 607 companies tracked

RevenueBase identified 607 test consulting firms headquartered in the United States as of September 2026 and tracks 29,874 professional contacts across them, including 9,262 with verified work emails. Houston is the largest hub.

This list covers test consulting firms 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 29, 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 29, 2026 86% judged on-target in blind review

607Companies

29,874Contacts tracked

9,262Verified emails

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The 25 largest test consulting firms based in the United States

Ranked by team size

Top 25 of 607 test consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to test consulting firms: 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	UL Solutions	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 29, 2026	10001+	12,316 contacts →
	Indirect evidence “A global leader in applied safety science, UL Solutions (NYSE: ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110…” Source: RevenueBase Database · checked Sep 29, 2026
2	Applause	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 29, 2026	201-500	1,396 contacts →
	Indirect evidence “Applause is the global leader in managed software testing services and digital quality.” Source: RevenueBase Database · checked Sep 29, 2026
3	PSI Services LLC	Indirect evidence	Olathe, KS, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,022 contacts →
	Indirect evidence “PSI has over 70 years of experience providing worldwide testing solutions to corporations, federal and state government agencies, professional associations, certifying bodies and…” Source: RevenueBase Database · checked Sep 29, 2026
4	A1qa	Indirect evidence	Decatur, GA, United StatesHQ checked Sep 29, 2026	1,001-5,000	980 contacts →
	Indirect evidence “a1qa is a global software testing and QA outsourcing company trusted by IT firms and Fortune 500 enterprises to deliver software quality that holds under real-world pressure.” Source: RevenueBase Database · checked Sep 29, 2026
5	Qasource	Indirect evidence	Pleasanton, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	906 contacts →
	Indirect evidence “QASource is a leading provider of outsourced software quality engineering services, offering scalable and customizable QA solutions to clients worldwide.” Source: RevenueBase Database · checked Sep 29, 2026
6	Applied Technical Services, LLC	Partial evidence	Marietta, GA, United StatesHQ checked Sep 29, 2026	1,001-5,000	890 contacts →
	Partial evidence “Applied Technical Services assists commercial and industrial clients by providing inspection, testing, consulting engineering, and calibration services.” Source: RevenueBase Database · checked Sep 29, 2026
7	Professional Service Industries, Inc. PSI	Indirect evidence	Arlington Heights, IL, United StatesHQ checked Sep 29, 2026	1,001-5,000	778 contacts →
	Indirect evidence “Intertek, a leading provider of quality solutions to industries around the world, has completed the acquisition of Professional Service Industries, Inc.(PSI), a leading…” Source: RevenueBase Database · checked Sep 29, 2026
8	TÜV Rheinland North America	Indirect evidence	Boxborough, MA, United StatesHQ checked Sep 29, 2026	501-1,000	712 contacts →
	Indirect evidence “TÜV Rheinland is a world leader in testing, inspection and certification services for a wide variety of industries.” Source: RevenueBase Database · checked Sep 29, 2026
9	Thinksys INC	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 29, 2026	201-500	461 contacts →
	Indirect evidence “ThinkSys is a QA outsourcing and software testing company for SaaS, FinTech, and Healthcare engineering teams that need reliable quality at scale.” Source: RevenueBase Database · checked Sep 29, 2026
10	ILAB	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 29, 2026	501-1,000	417 contacts →
	Indirect evidence “iLAB specializes in Software Quality Assurance services, providing global solutions to our customers.” Source: RevenueBase Database · checked Sep 29, 2026
11	Astegic	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 29, 2026	51-200	415 contacts →
	Indirect evidence “For 15 years, Astegic has been helping Fortune 500 through startup companies with their Testing & QA needs.” Source: RevenueBase Database · checked Sep 29, 2026
12	Logigear Corporation	Indirect evidence	San Mateo, CA, United StatesHQ checked Sep 29, 2026	501-1,000	403 contacts →
	Indirect evidence “We are celebrating 30 years of testing excellence and innovation at LogiGear, we're proud to be a cornerstone in our clients' journeys, delivering confidence not just in our…” Source: RevenueBase Database · checked Sep 29, 2026
13	Quality Professionals Q-Pros	Indirect evidence	TX, United StatesHQ checked Sep 29, 2026	501-1,000	347 contacts →
	Indirect evidence “Quality Professionals (Q-Pros) is a global independent software Quality Assurance and Testing services provider supporting enterprise and government organizations.” Source: RevenueBase Database · checked Sep 29, 2026
14	Smithers	Partial evidence	Akron, OH, United StatesHQ checked Sep 29, 2026	501-1,000	310 contacts →
	Partial evidence “Founded in 1925 and headquartered in Akron, Ohio, Smithers is a multinational provider of testing, consulting, information, and certification services.” Source: RevenueBase Database · checked Sep 29, 2026
15	Vaisesika	Partial evidence	Carlsbad, CA, United StatesHQ checked Sep 29, 2026	201-500	266 contacts →
	Partial evidence “Vaisesika Consulting is a global tech and consulting firm that helps businesses transform their digital setups and stay compliant in a straightforward way.” Source: RevenueBase Database · checked Sep 29, 2026
16	Q Analysts	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 29, 2026	201-500	249 contacts →
	Indirect evidence “Quality in An AI Driven World.” Source: RevenueBase Database · checked Sep 29, 2026
17	MGA Research Corporation	Indirect evidence	Akron, NY, United StatesHQ checked Sep 29, 2026	201-500	224 contacts →
	Indirect evidence “MGA is recognized worldwide as one of the leading independent providers of testing services and equipment.” Source: RevenueBase Database · checked Sep 29, 2026
18	PRO QC International	Indirect evidence	Mchenry, IL, United StatesHQ checked Sep 29, 2026	501-1,000	211 contacts →
	Indirect evidence “Pro QC International provides tailored quality solutions with a human touch in 100 countries.” Source: RevenueBase Database · checked Sep 29, 2026
19	Kualitatem INC	Indirect evidence	NY, United StatesHQ checked Sep 29, 2026	201-500	186 contacts →
	Indirect evidence “Kualitatem empowers businesses to deliver quality software.” Source: RevenueBase Database · checked Sep 29, 2026
20	Impactqa	Partial evidence	Plano, United StatesHQ checked Sep 29, 2026	201-500	181 contacts →
	Partial evidence “Welcome to ImpactQA – Where Excellence Meets Innovation in Software Testing and QA Consulting About Us ImpactQA is a premier Software Testing and QA consultancy delivering…” Source: RevenueBase Database · checked Sep 29, 2026
21	Qualitylogic	Indirect evidence	Boise, ID, United StatesHQ checked Sep 29, 2026	51-200	157 contacts →
	Indirect evidence “QualityLogic delivers full spectrum QA products and services to technology companies in rapidly evolving markets, or where transformative technologies are changing the world.” Source: RevenueBase Database · checked Sep 29, 2026
22	Abstracta	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 29, 2026	51-200	136 contacts →
	Indirect evidence “We deliver Quality Intelligence for engineering teams.” Source: RevenueBase Database · checked Sep 29, 2026
23	Flexasoft	Partial evidence	Redmond, WA, United StatesHQ checked Sep 29, 2026	51-200	128 contacts →
	Partial evidence “FleXasoft is a Redmond, Washington based software consulting firm specializing in Software Development and Quality Assurance Testing.” Source: RevenueBase Database · checked Sep 29, 2026
24	MSR Technology Group	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 29, 2026	1,001-5,000	124 contacts →
	Indirect evidence “As a leader in professional services, MSR Technology Group ignites growth for businesses across diverse industries.” Source: RevenueBase Database · checked Sep 29, 2026
25	RTTS	Partial evidence	NY, United StatesHQ checked Sep 29, 2026	51-200	120 contacts →
	Partial evidence “RTTS is the premier pure-play QA & Testing organization that specializes in Test Automation.” Source: RevenueBase Database · checked Sep 29, 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: test consulting firms. 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 test consulting firms.
Partial evidence: Its own public description names part of test consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name test consulting firms. 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 607 test consulting firms based in the United States

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Test consulting firms based in the United States at a glance

As of Sep 29, 2026

31.0%Verified-email coverage

49.2Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · Houston

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

335

11-50

150

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 607 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 test consulting firms, 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 “test consulting firms”. 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 test consulting firms), 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 test consulting firms, 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, 9,262 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 29, 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 test consulting firms, 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 test consulting firms are there based in the United States?

RevenueBase identified 607 test consulting firms 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?

UL Solutions, headquartered in Northbrook, tops this list with the largest team on record.

Which city has the most test consulting firms?

Houston leads with 19 headquartered companies, followed by New York (13) and Los Angeles (11).

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 9,262 verified decision-maker contacts tracked across these 607 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 29, 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.