Diffblue
Writes and verifies regression tests for Java and Python code
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About Diffblue
Development teams with thin test coverage use Diffblue to write regression tests. Its testing agent measures coverage first, generates unit tests, then checks that they compile and pass. It runs inside CI pipelines and works through AI coding tools such as GitHub Copilot CLI and Claude Code. Pricing follows the net new coverage lines added. It is a paid product best known for Java.