Cosmic Ray vs Mutineer
| Cosmic Ray | Mutineer | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | — | — |
| Open source | No | No |
| Platforms | Linux, self-hosted | — |
| Free plan | Yes | — |
| Supported languages | Python 3 | JavaScript, TypeScript |
| Test frameworks | unittest, pytest, nose | Vitest, Jest |
| 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 | Equality flips, boundary changes, logical operator changes, arithmetic operator changes, return-value changes, Vue composition and template-directive mutations |
| Mutation quality gate | — | Yes |
Both are listed in Best Mutation Testing Tools. On Samsung Mobile US Press, Cosmic Ray scores higher on our published basis.