Best Software Testing Tools Companies in United Kingdom
The 96 best Software Testing Tools companies in United Kingdom in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: PortSwigger.
$272 million in disclosed funding across 96 tracked companies tells you the United Kingdom's Software Testing Tools sector is serious money, not a niche curiosity. This directory ranks those companies by equity raised and recent funding momentum, so you can cut straight to who's actually capitalized. PortSwigger leads the field at $112 million, nearly double the combined total of every other named filer here. Diffblue follows at $46 million, Push at $19 million. Those two data points alone show how concentrated the funding curve is.
Hot themes right now are product qualification testing, safety compliance, and chemical safety assessments, which I'd argue reflects tightening regulatory pressure as much as any technology cycle. AI-driven automation partnerships are reshaping how enterprise testing gets delivered, and according to top software testing tools coverage, the tooling market is fragmenting fast. So where does that leave smaller filers like Cytix at $2 million or Synthesized at $3 million? Competing on specialization, mostly. Mercia, Parkwalk, and Techstart Ventures are the most active backers in this cohort, which signals institutional confidence in the segment's durability. One unicorn sits inside these 96 companies. That's the benchmark worth chasing.
Ranked: Best Software Testing Tools companies in United Kingdom
| # | Company | Disclosed funding | Last round | Employees | Founder | Tech stack | Stage | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Acunetix Cloud based security testing platform | — | — | 53 | — | WordPressMySQLPHP+24 | Unfunded | — | — |
| 2 | API Kaizen Web based API Testing | — | — | — | Robin Birtle CEO & Director | — | Deadpooled | — | — |
| 3 | AppTesto limited Performance testing tool across WAN, Cloud and Moble WLAN | — | — | — | Nora Murphy Founder & Director | — | Deadpooled | — | — |
| 4 | AVORD Provider of cybersecurity services including penetration testing and threat intelligence | — | — | 3 | Brian Harrison CEO | — | Funding Raised | — | — |
| 5 | benchQA Test Automation Software for K2 platform | — | — | — | Arno van Rooyen Managing Director | — | Unfunded | — | — |
| 6 | BetaTesta Tool to test apps and get feedback | — | — | — | Sam Dickie Founder | — | Deadpooled | — | — |
| 7 | BrowserSpy Platform offering bug tracking software | — | — | — | Simon Emms Founder | — | Deadpooled | — | — |
| 8 | Bug Purge Bug Tracking Software | — | — | — | Richard Mohammed CEO | — | Unfunded | — | — |
Top 12 Software Testing Tools companies in United Kingdom
#1
Series A · Oxford, England · founded 2016 · 42 employees$46Mraised▾
Developer of AI-powered autonomous unit testing tools for Java applications. The company provides an agent designed for generating high-quality Java unit tests. It delivers coverage with minimal developer effort, updating or removing tests as application logic changes. The agent analyzes code, generates JUnit tests, and tracks coverage.
- Mar 2025Grant (prize money)$1.3M
- Oct 2024Series A$6.3M
- Dec 2023Series A—
- Nov 2022Series A$8M
#2
Series B · St Albans, England · founded 2020 · 1 employees$19.3Mraised▾
Provider of browser threat detection and response security platform. It offers real-time detection of in-browser attacks, including phishing and account takeover attempts. The platform delivers browser telemetry to detect attacks and harden security posture. It guides users to safer behavior by enforcing multi-factor authentication and strong credentials.
- Feb 2025Series B$30M
- Apr 2023Series A$15.3M
- Jul 2022Seed$4M
#3
Late Stage · Knutsford, England · founded 2008 · 109 employees$112Mraised▾
Portswigger has developed a Java application called Burp suite for performing dynamic security testing of web applications with key components for inspecting network traffic by a proxy server, web spider for mapping apps, application scanning and vulnerability testing through custom intruders and a repeater tool to send different requests to server for app-testing.
- Jun 2024PE$112M
#4
Series A · London, England · founded 2017 · 12 employees$2.8Mraised▾
Developer of synthetic data generation platform for machine learning model development. It provides tools to create datasets that mimic real-world data. This enables organizations to train and validate machine learning models. The platform offers features for data augmentation and privacy preservation.
- May 2025Series A$22M
- Feb 2024Conventional Debt—
- Dec 2021Series A$4.9M
- Feb 2020Series A$3.3M
#5
Series A · Manchester, England · founded 2022 · 7 employees$2.4Mraised▾
Cyber risk and vulnerability assessment platform. It is a cloud vulnerability management platform that allows users to integrate security testing into their workflow. It allows users to identify and resolve vulnerabilities with the help of a cluster of dedicated pen-testers.
- Sep 2024Series A$2.1M
- Apr 2023Seed$285.7K
#6
Seed · London, England · founded 2021 · 10 employees$4.1Mraised▾
Provider of bug tracking tools. The platform offers tools that help in identifying errors in the script automatically. It also detects bugs and prevents errors in production. It works by posting debugging comments, pulling requests, collects data, etc. It works on a subscription plan.
- Jan 2024Seed$4M
- Sep 2021Seed$125K
#7
Series A · London, England · founded 2016 · 166 employees$17.9Mraised▾
Automated testing solutions for web applications. The product offers a cloud based platform for functional, UI, compatibility, and integration testing across both web and mobile web applications. The features of the product include testing transformation, accessible automation, etc. It also provides integration over slack, Azure, git, circleci, etc. The clients of the company are JATO, PERSIMMON, experian, macmillan learning, etc.
- Nov 2021Series A$13.3M
- Aug 2019Seed$3.2M
- Jan 2018Seed$1.3M
#8
Series A · London, England · founded 2004 · 28 employees$6Mraised▾
Developer of an AI-powered platform for ServiceNow automated testing. The platform facilitates test creation using natural language inputs. It provides solutions for DevOps acceleration and monitoring. The platform offers integrated solutions designed to make enterprise testing more efficient.
- Jan 2023Series A$6M
- Seed—
#9
Series B · Cambridge, England · founded 2005 · 46 employees$25.7Mraised▾
Undo provides reversible debugging tools for C/C++ tools for Linux and Android. Its products include Live Recorder to have a complete record of the program's execution in the production environment and UndoDB - a high-performance reversible debugger for Linux and Android. Features include deferred recording, cross-machine replay, multi-threaded application recording, etc. Some of its customers include ARM, Cadence, Credit Suisse, Daimler, Fico, Gurobi, HoneyWell, IBM, JP Morgan Chase, etc.
- Sep 2019Series B$4.9M
- May 2018Series B$14M
- Oct 2016Series A$3.3M
- Apr 2015Series A$2M
#10
Series B · London, England · founded 2014 · 159 employees$12Mraised▾
Cloud based automated software testing platform. It provides test automation solutions for salesforce. The platform allows users to create, execute, and debug tests using low code tools. It enables users to test workflows such as salesforce, email, database, and more.
- Feb 2022Series B$6.8M
- Jan 2021Series A$5.2M
- Nov 2014Seed—
#11
Deadpooled · Theale, England · founded 2011 · 22 employees$10.6Mraised▾
UserReplay is a record and session replay and reporting tool for of all website visitors to find and fix website issues. It provides a dashboard to show the customer experience analytics and it can also identify and alert on customer experience issues in real time. The real-time dashboard provides a single view where you can get instant visibility of alarming trends. Has offices in UK and in USA. Customers include Pizza Hut, DirectFerries.co.uk, Sports Direct and CoFunds.
- Feb 2016Series A$4.7M
- Oct 2014Series A$3.2M
- Oct 2014Grant (prize money)$400K
- Dec 2013Seed$500K
#12
Seed · Manchester, England · founded 2015 · 26 employees$1.4Mraised▾
Provider of data migration, integration, software testing, and strategic teaming services. The company delivers data solutions for seamless data flow across systems. It offers data migration from legacy to cloud platforms, ensuring data quality. Real-time data migration keeps systems synchronized, eliminating inefficiencies. The company automates complex processes, saving time and reducing errors. It delivers data projects on time, within budget, and to quality standards.
- Sep 2022Seed$1.4M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Software Testing Tools coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.