Diffblue

Diffblue is a Coding & Development tool that autonomously generates, verifies, and fixes unit tests for enterprise codebases. It orchestrates AI coding tools to achieve comprehensive, high-quality test coverage.

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At a glance

Pricing

Paid · Usage-based · Enterprise

Free tier

API

Skill level

Technical

About

What is Diffblue?

Diffblue Testing Agent is an AI-powered solution designed to automate the generation, verification, and fixing of unit tests for enterprise codebases. It orchestrates existing AI coding tools like GitHub Copilot and Claude Code to create comprehensive, high-quality test coverage, significantly reducing the need for manual developer intervention. The tool addresses the challenge of AI coding agents failing to deliver sufficient test coverage and requiring constant babysitting, by providing an autonomous, project-level testing solution. It supports Java 8, 11, 17, 21, 25 and Python, with upcoming support for Gemini and Codex. Diffblue offers outcome-based pricing, charging per verified line of coverage added, ensuring users only pay for effective tests.

Best used for

Ideal for developers and software engineers who need to automate unit test generation, ensure high code coverage, and modernize legacy Java codebases. Especially valuable for large enterprises requiring robust, verified testing solutions and those with strict security or compliance needs.

Common actions

generate unit tests

automate testing

verify code quality

modernize legacy code

improve code coverage

Capabilities

Key features

Autonomous unit test generation
Test verification and fixing
Orchestrates AI coding tools
Project-level test generation
Supports Java and Python
Outcome-based pricing
On-premises deployment

Target Audience

developer

Integrations

github-copilotclaude-code

Pricing & Plans

Paid · Usage-based · Enterprise · Starting at USD 30.00

$30 per month or $330 per year for the Developer plan. Additional tiers available.

FAQs

What programming languages does Diffblue Testing Agent support?

Diffblue Testing Agent currently supports Java versions 8, 11, 17, 21, and 25, as well as Python 3.9+. The company also plans to introduce support for Gemini and Codex in the near future.

How is Diffblue Testing Agent priced?

Diffblue uses an outcome-based pricing model. You are charged per verified line of net new coverage added to your codebase, ensuring you only pay for tests that compile, pass, and improve coverage. Pricing starts at $1500 for 5,000 lines.

Can Diffblue Testing Agent be deployed on-premises?

Yes, Diffblue offers on-premises deployment options for regulated environments that require air-gapped solutions or strict data control. They also provide Diffblue Cover for deterministic, offline Java unit test generation without external dependencies.

Does Diffblue replace my existing AI coding agent?

No, Diffblue Testing Agent works with your existing enterprise-approved AI coding platforms, such as GitHub Copilot Enterprise and Claude Code. It orchestrates these tools to generate and verify tests, rather than replacing them.

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