Cosmic Ray vs Stryker Mutator
| Cosmic Ray | Stryker Mutator | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Linux, self-hosted | api, self-hosted |
| Free plan | Yes | Yes |
| Supported languages | Python 3 | JavaScript, TypeScript, C#, Scala |
| Test frameworks | unittest, pytest, nose | Cucumber, Jasmine, Jest, Karma, Mocha, Tap, Vitest, command runner |
| 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 | Arithmetic Operator, Array Declaration, Block Statement, Boolean Literal, Conditional Expression, Equality Operator, Logical Operator, Method Expression, Object Literal, Optional Chaining, Regex, String Literal, Unary Operator, Update Operator |
| Mutation quality gate | — | Yes |
Both are listed in Best Mutation Testing Tools. On Samsung Mobile US Press, Stryker Mutator scores higher on our published basis.