QA and Testing Agencies in California

5 QA and Testing agencies are listed in California, United States. 4 have been assessed on the Agency List Score as of October 2026; the highest-ranked is Coeus Solutions at 95.6.

Ranked · 4 assessed

Ordered by Agency List Score
#1 of 4 assessed
Coeus Solutions
96

Web and PPC services for inbound lead capture and search visibility

Mobile App Testing
#2 of 4 assessed
QASource
91

AI-driven QA and testing for diverse industries

Accessibility TestingAutomated TestingMobile App Testing
#3 of 4 assessed
Coreteka Custom Software Development
75

Custom software for fintech, logistics, retail, and agrifood businesses

Mobile App Testing
#4 of 4 assessed
Cerebruminfotech
73
Verified

Building iOS, Android, and cross-platform apps with cloud architecture and QA automation

Automated TestingMobile App Testing

Also in California · 1 not yet assessed

Listed agencies queued for assessment. Alphabetical.

About this ranking

What this page ranks

This page ranks the 4 QA and Testing agencies in California, United States that have been assessed on the Agency List Score, out of 5 listed.

The score measures how well an agency documents its own work in public — named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than described as the client's own results. It does not measure client satisfaction, price, or availability.

Cohorts and awards

Agencies are compared within a cohort — here, QA and Testing in California, United States. A cohort must be large enough to express the band being awarded: at least 8 assessed agencies for a top 25% award, 20 for top 10%, 40 for top 5%, and 300 for top 1%. This one holds 4, so no award can be issued here.

The 1 QA and Testing agency not yet assessed is listed on this page but not ranked.

Read the full methodology

Paid placement

Partner agencies can buy a labelled placement block above the ranking on this page. It is always marked as paid and is never mixed into the ranked list.

Placement is paid; it does not affect the ranking, cohort membership, or any agency's score. Ranking position, cohort membership and the score itself are not for sale.

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Questions

How many QA and Testing agencies are in California, United States?
5 are listed on Agency List in California, United States. 4 of them have been assessed on the Agency List Score as of October 2026.
Which QA and Testing agency in California, United States is ranked highest?
Coeus Solutions, with an Agency List Score of 95.6, ranks #1 of 4 assessed agencies in QA and Testing in California, United States.
Why are 1 QA and Testing agencies listed here but not ranked?
1 of the 5 listed have not yet been assessed on the Agency List Score. They each have a profile and are listed below the ranking, alphabetically, rather than being hidden or mixed into it.
How is the ranking determined?
By Agency List Score, within the QA and Testing in California, United States cohort of 4 assessed agencies. The score is computed from evidence published on each agency's own website: named clients, quantified outcomes, and whether the outcome is attributed to the agency. Paid placement does not affect it.