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Top Software Testing Companies for WordPress

5 of 9 software testing companies ranked on evidence in the Q4 2026 edition.

WordPress runs a very large proportion of the world's websites, which means the providers listing it range from firms that install a purchased theme to teams that build bespoke systems on it as an application framework. The gap between those two is enormous and the label does not distinguish them.

The questions that do: is this a custom theme or a licensed one, and who renews the licence? How many plugins does the build depend on, and what happens when one is abandoned? Who applies core and plugin updates after launch, and how quickly when a security release lands? Most inherited WordPress problems trace back to a site nobody was contracted to maintain.

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Between them, the 9 software testing companies on this page cover web development (8), IT services (8), web design (8) and PHP (8). They also list work in United Kingdom and United States of America. 9 of them have written a profile you can read before you get in touch.

TrustList ranking

Q4 2026 edition

5 of 9 software testing companies ranked on evidence held on 6 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

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All software testing companies 5 ranked SMEs 5 ranked

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2T
2i Testing
Web Development · IT Services · Web Design · Also in United Kingdom
2i Testing provides independent software testing and quality assurance consultancy, mainly for UK financial services and public bodies
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Why #1: Founded 2005 · Team of 100+, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Tescomus
Web Development · IT Services · Web Design · Also in United States of America
Tescomus, trading as Tescom US, is a software testing company in Atlanta, Georgia.
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Why #2: Founded 1999, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Testing Circle
Web Development · IT Services · Web Design · Also in United Kingdom
Testing Circle is a London software testing services company. It provides consultancy and supplies testing staff to clients across the UK and Europe, and it has done so since 2005.
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Why #3 (shared): Founded 2005, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
2i Testing
Web Development · IT Services · Web Design · Also in United Kingdom
2i Testing is a software testing and quality assurance consultancy that began in 2005.
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Why #3 (shared): Founded 2005, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Testnomics
Web Development · IT Services · Web Design · Also in United Kingdom
Testnomics is a software testing and quality assurance service provider based in the United Kingdom.
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Why #5: Founded 2018, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
Testhouse Ltd
Web Development · IT Services · Web Design · Also in United Kingdom
Testhouse Ltd is a software quality engineering firm. It provides testing, consulting and training, delivered on-site, on-shore or off-shore, either as an outsourced service or on…
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On record: Team of 200+, as stated on its own website, read 5 Oct 2026
Flex Group
PHP · Automation · Also in Poland
Imagine a development team... We are a Poland based company, performing high-end development in Ukraine and Poland Since 2014 our biggest goal has been to become the most reliable…
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Mtest Labs Limited
Web Development · IT Services · Web Design · Also in United Kingdom
Mtest Labs Limited is a software testing consultancy that also sources technical talent for its clients.
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Perfecto
Web Development · IT Services · Web Design · Also in United States of America
Perfecto provides a cloud-based environment for testing web and native apps.
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Top Software Testing Companies for WordPress

2i Testing

Tescomus

Testing Circle

2i Testing

Testnomics

Testhouse Ltd

Flex Group

Mtest Labs Limited

Perfecto

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