Best Cosmic Ray Alternatives in 2026
Updated
20 platforms from mutation testing tools ranked against Cosmic Ray on the same published basis.
- 1Cosmic Ray vs Stryker Mutator
- 2Cosmic Ray vs ArcMutate
- 3Cosmic Ray vs Mutant
- 4Cosmic Ray vs Mutatest
- 6Cosmic Ray vs Infection
- 7Cosmic Ray vs muttest
- 8Cosmic Ray vs Dextool Mutate
- 9Cosmic Ray vs PIT
- 10Cosmic Ray vs cargo-mutants
- 11Cosmic Ray vs go-mutesting
- 12Cosmic Ray vs mutator
- 13Cosmic Ray vs Mutineer
- 14Cosmic Ray vs pytest-gremlins
- 15Cosmic Ray vs MuJava
- 16Cosmic Ray vs Muter
- 17Cosmic Ray vs mutmut
- 18Cosmic Ray vs pymute
- 19Cosmic Ray vs Gambit
- 20Cosmic Ray vs LittleDarwin
- 21Cosmic Ray vs mutest-rs
Cosmic Ray alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Stryker Mutator | 7.3 | Free plan | Free | API, self-hosted |
| 2 | ArcMutate | 6.0 | Free plan | $8/mo | Linux, Mac, self-hosted, Windows |
| 3 | Mutant | 6.0 | Free plan | $20.83/mo | Linux, Mac |
| 4 | Mutatest | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 6 | Infection | 5.6 | No | — | Linux, Mac, Web |
| 7 | muttest | 5.6 | No | — | Linux, Mac, Windows |
| 8 | Dextool Mutate | 5.5 | No | — | Linux, self-hosted |
| 9 | PIT | 5.5 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | cargo-mutants | 5.4 | No | — | Linux |
| 11 | go-mutesting | 5.4 | No | — | Linux |
| 12 | mutator | 5.2 | No | — | — |
| 13 | Mutineer | 5.2 | No | — | — |
| 14 | pytest-gremlins | 5.2 | No | — | — |
| 15 | MuJava | 5.1 | No | — | Windows, Linux |
| 16 | Muter | 5.1 | No | — | Mac |
| 17 | mutmut | 5.1 | No | — | Windows, Mac, Linux |
| 18 | pymute | 5.1 | No | — | — |
| 19 | Gambit | 5.0 | No | — | Mac, Linux, Windows |
| 20 | LittleDarwin | 5.0 | No | — | — |
| 21 | mutest-rs | 5.0 | No | — | — |
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Questions about Cosmic Ray alternatives
What is the best alternative to Cosmic Ray?
Stryker Mutator, number 1 in mutation testing tools with a score of 7.3 out of 10. The others here: ArcMutate, Mutant, Mutatest and 16 more.
What is the best free alternative to Cosmic Ray?
Stryker Mutator is the best-ranked alternative with a free plan. 4 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.