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Diffblue Cover
Autonomous AI for Java unit testing. Uses reinforcement learning to write, maintain, and run verified JUnit tests that compile and pass, increasing coverage and catching regressions automatically.
About Diffblue Cover
What the tool does and who it's for
Diffblue Cover is an autonomous AI platform that uses reinforcement learning to write, maintain, and update Java unit tests. Unlike LLM-based tools that predict code, Diffblue Cover guarantees that every generated test compiles and runs correctly. It analyzes Java applications to create human-readable JUnit tests that reflect current behavior, helping developers increase coverage by up to 250x. It integrates directly into IntelliJ IDEA and CI/CD pipelines, allowing teams to catch regressions early without manual test writing. The tool operates entirely on-premises or within a private environment, ensuring that sensitive source code never leaves the organization.
Key capabilities
Pricing
Freemium — plans below
Community Edition
Free
- IntelliJ IDEA plugin
- Basic Java unit test generation
- Individual use only
- Community support
Developer Edition
$30/month
- 100 methods under test per month
- IntelliJ IDEA plugin
- Full Java & Kotlin support
- Email support
Teams Edition
$30,000/year
- CLI support
- CI pipeline integration
- Up to 250,000 lines of code
- Analytics dashboards
- Standard support
Enterprise
Contact sales
- Unlimited lines of code
- Cover Optimize (runs only relevant tests)
- On-premises deployment
- SSO / SAML integration
- Dedicated account manager
- Enterprise SLAs
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