University of Oxford spin-out Diffblue launches Diffblue Playground

Makes AI for Code freely available for developers worldwide

London, 25 February 2019 - University of Oxford AI spin-out, Diffblue today launches Diffblue Playground, a new free tool that allows developers to experience the power of AI for code for the very first time.

Diffblue Playground uses industry-leading Artificial Intelligence to generate unit tests for code in seconds, for free and with zero implementation effort. Diffblue Playground writes unit tests as a human would and can be used by students, hobbyists or professionals to better understand their code, write unit tests automatically and learn testing best practice.

Diffblue has made Playground freely available to the entire developer community, and includes the option to import your own code or try Diffblue Playground against a variety of code examples, giving developers the ability to see it in action immediately. A live chat option is also available to facilitate a dialogue between users and the Diffblue team for questions and technical support queries.

Diffblue Playground is a cloud-native serverless version of the company’s flagship product Diffblue Cover, a developer productivity tool that uses AI for code to automate unit testing. It is used by multinational companies across the world. Diffblue was spun out of the University of Oxford’s Computer Science department in 2016 and raised a $22m Series A round in June 2017, led by Goldman Sachs Principal Strategic Investments and OSI.

Daniel Kroening, Professor of Computer Science at the University of Oxford, founder and CEO of Diffblue, said: “This is our way to connect with the next generation of developers. Since we founded Diffblue, we’ve wanted to get AI for Code into the hands of as many developers as possible. With Diffblue Playground, we’re excited to show the world the power of AI for Code and the boundless potential of using next-generation technology to improve the way in which we test and develop software. We know that testing remains a real and growing pain point for developers and we anticipate significant demand from developers around the world who can use this for free.”

Peter Schrammel, CTO of Diffblue, added: “According to Stack Overflow, over 80% of developers code as a hobby, and we’re excited to finally be able to offer it to the community of developers hungry for freely available resources. Until now, access to AI-powered automated unit testing products has been limited to commercial enterprises, and we look forward to seeing the reaction of the developer community. In particular, we are keen to hear from users on what changes they’d like to see made as we continue to iterate Playground.”

To sign up and start using Diffblue Playground go to

About Diffblue

Founded by world leading computer scientists from University of Oxford, Diffblue is changing the way code is developed. Diffblue’s first product, Diffblue Cover, intelligently writes unit tests, providing benefits to software development teams and organisations. Diffblue also engages in cutting edge research through its Labs initiatives and in the open source community. Headquartered in Oxford, Diffblue is funded by Goldman Sachs and Oxford Sciences Innovation.

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