
Autonomous AI Agent for Java software testing.
Founded: 2016 (Oxford University spin-out)
Product: Diffblue Cover — AI-driven Java unit-test generation
Employees: 125
Total funding: USD 43,400,000
Automated software testing and code-quality automation for Java
2016
Developer tools / Software testing
USD 22,000,000
Reported Series A to commercialize AI-driven automated testing and related tools
Announced funding round listing investors including University of Oxford, Parkwalk Advisors, IP Group, Citi Institutional Strategic Investments, and AlbionVC
Diffblue is one of the most powerful use cases for artificial intelligence in the world today. Developers typically spend 25% to 50% of their time writing unit tests, a task that is not widely enjoyed. Our product, Diffblue Cover, is a generative AI agent that automatically writes and maintains unit tests for Java applications. It works 250 times faster than a human and is 26 times more productive than an experienced developer using the latest LLM-based code assistant tools like Copilot. We enable our customers to ship better quality software faster and with less toil for developers.
Diffblue spun out of the University of Oxford and is backed by leading UK VCs like IP Group, Albion VC, and Parkwalk, as well as Citi (also a customer). Our software is used by some of the most demanding and sophisticated software development organizations in the world, including BNY, Capital One, S&P Global, ING, and Workday.
As an early-stage company in one of the hottest software markets, Diffblue offers a fast-paced, customer-focused, empowering, and collaborative working environment. If you’re interested in a company where your skills and effort can make a difference every day, then you should check us out.
While we expect the future of work to continue to be a hybrid model, we have a great environment in our Oxford-based head office with beautiful open-plan space and lots of natural light.