We’re diffblue, an ai for code company

We’re on a mission to change the way software is written, forever.

Diffblue uses game changing AI technology to fundamentally transform the way developers write code. Our goal is to empower dev teams to be wildly more productive by automating tedious and time-consuming parts of the software development life cycle (SDLC) so that they focus on building products that people use and love.

All the reward, and none of the risk. Unlike LLMs or code completion tools, our technology uses reinforcement learning to generate code that is guaranteed to run, compile and be correct — every time. Plus, we operate on-prem so your code stays within your own environment, never seen and never shared.

2,123,862 +

unit tests written by our Community Edition

232.0 years

saved of developer time

125 x

faster than a human developer

Autonomous and scaleable. Our platform runs autonomously and doesn’t require a human developer to review code outputs line by line. Capable of writing a unit test every 2 seconds, it can write tens of thousands of tests within the space of a few hours, covering entire applications.

Deterministic and accurate. Every test we write is accurate for the code you’ve got and is guaranteed to run, compile and be correct. Our patented reinforcement learning technology has high levels of precision and a 0% error rate.

Continuous and maintained. Once tests are written, we maintain those tests and update them whenever a code change is made. Our platform runs continuously in the background.

Protected and secure. Operating behind your firewall, your code is never seen, shared or used for training so your IP is 100% safe and secure.

Our history

Coding for impact.  From day one.

Diffblue Cover augments developers by automating away tedious and time-consuming aspects of the unit and regression testing process.

2016

Diffblue spun out of Oxford University AI research group. Received early seed funding from Oxford Science Enterprises.

2017

Diffblue closes one of Europe’s largest series A funding rounds.

2020

Launch of Diffblue Cover, a platform that autonomously writes unit tests for Java applications. Gartner names Diffblue a Cool Vendor in Agile and DevOps.

2022

Secures £6.7m funding to scale autonomous software writing platform, led by Albion Capital.

2023

Announcement of Citi as a new strategic institutional investor. Granted 3 US patents for autonomous AI technology.

2024

Expands CI capability, adding GitLab and GitHub as integration partners. Gartner names Diffblue Cool Vendor for AI-Augmented Development and Testing for Software Engineering.

Investing in the future of AI for Code

Meet our leadership team

Toffer Winslow

CHIEF EXECUTIVE OFFICER

Toffer brings three decades of enterprise software leadership experience to his role as CEO of Diffblue. He has held CEO, GM, CRO, and CMO roles at companies including Dynatrace, RSA Security, StackState, and Tamr. He has an MBA from Harvard and an undergraduate degree from UBC.

Peter Schrammel

CO-FOUNDER & CTO

Peter co-founded Diffblue and has significant experience as a software project lead in the embedded systems industry and a strong track record in program analysis. He is also an Assistant Professor of Computer Science at the University of Sussex.

Jane Silber

CHAIR

In her role as Chair of Diffblue, Jane brings valuable executive experience in growing software companies that developers love. She was previously CEO of Canonical and is currently a non-executive director at Canonical and The Sensible Code Company.

James Barrington-Wells

CHIEF FINANCE OFFICER

James brings over 15 years of financial experience with the last 5 years as CFO/Head of Finance in venture capital backed and owner managed high-growth start-ups. He is an ACA qualified Chartered Accountant having trained at Deloitte in audit before specialising in transaction services and then corporate finance.

Swetha Sundaram

Head of HR

With over 15 years of International HR experience across different industries and scaling startups, Swetha is a commercially astute business partner, passionate about building winning teams and creating great employee experiences.

Andy Piper

VP OF ENGINEERING

Previous Head of Product Engineering at CBRE and the CTO of Push Technology Limited, Andy has more than 20 years of combined engineering and technology leadership experience. He holds a PhD in computer science from the University of Cambridge.

Cassy Locke

HEAD OF MARKETING

Cassy has 15 + years of experience marketing B2B tech products across enterprises and startups, 8 of which were based in Singapore leading Marketing Operations for AWS APAC regions, Demand generation for Twitter Global Business Marketing Team and most recently heading up Marketing for ML deployment platform, BasisAI, which was acquired in 2020.

Be part of the AI for code revolution

Diffblue is operating in the hottest space right now. Join the team to help build products that will change the game for software development forever.

Join us