Cosmic Ray vs PIT
| Cosmic Ray | PIT | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | — | — |
| Open source | No | No |
| Platforms | Linux, self-hosted | Linux, macOS, self-hosted, Windows |
| Free plan | Yes | Yes |
| Supported languages | Python 3 | Java and JVM bytecode |
| Test frameworks | unittest, pytest, nose | JUnit 3, JUnit 4, TestNG; JUnit 5 via plugin |
| Incremental analysis | Yes | Yes |
| Parallel execution | Yes | Yes |
| Surviving mutant reports | Yes | Yes |
| Mutation operators | binary operator replacement; boolean replacement; break/continue replacement; comparison operator replacement; exception replacement; keyword replacement; number replacement; decorator removal; unary operator replacement; zero-iteration for loops | Conditionals Boundary, Increments, Invert Negatives, Math, Negate Conditionals, Void Method Calls, Empty Returns, False Returns, True Returns, Null Returns, Primitive Returns, Remove Conditionals, Inline Constant, Constructor Calls, Non-Void Method Calls, Remove Increments, Argument Propagation, Big Integer, Member Variable, Naked Receiver, Negation, Arithmetic Operator Replacement, Arithmetic Ope |
| Mutation quality gate | — | Yes |
Both are listed in Best Mutation Testing Tools. On Inferse, Cosmic Ray scores higher on our published basis.