Cosmic Ray vs Mutatest
| Cosmic Ray | Mutatest | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Linux, self-hosted | Linux, macOS, Windows |
| Free plan | Yes | Yes |
| Supported languages | Python 3 | Python |
| Test frameworks | unittest, pytest, nose | pytest |
| Incremental analysis | 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 | AugAssign; BinOp; bitwise comparison; bitwise shift; BoolOp; Compare; Compare In; Compare Is; If; Index; NameConstant; Slice |
| Mutation quality gate | — | Yes |
Both are listed in Best Mutation Testing Tools. On Samsung Mobile US Press, Mutatest scores higher on our published basis.