Best Mutation Testing Tools in 2026
Updated
In short: ArcMutate is ranked #1 of 25 as of 4 October 2026, ahead of Mutant and Mutatest. The best-ranked option with a free plan is Mutant. The lowest first paid tier on this page is ArcMutate at $8/mo.
Mutation testing helps you examine whether tests catch changes introduced into code. ArcMutate and PIT lead the ranking, followed by Infection and Stryker Mutator. Compare supported languages and test frameworks with the mutation operators each tool offers, then consider whether incremental analysis or parallel execution matters for your workflow. Surviving mutant reports and mutation quality gates describe how results can be presented or used. The listed free-plan and paid-from details provide cost context as you weigh compatibility, execution, and reporting needs for your testing setup.
25 mutation testing tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
4 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | ArcMutateWindows · Mac · Linux · Self-hosted | Three bars | — | 3 of 6 | $8/mo | 6.6 | |
| 2 | MutantMac · Linux | Two bars | — | 2 of 6 | $20.83/mo | 6.5 | |
| 3 | MutatestWindows · Mac · Linux | Three bars | — | 3 of 6 | Free | 6.5 | |
| 4 | Stryker MutatorSelf-hosted · API | Two bars | — | 0 of 6 | Free | 6.3 | |
| 5 | InfectionWeb · Mac · Linux | Two bars | — | — | 3 of 6 | — | 5.6 |
| 6 | muttestWindows · Mac · Linux | Two bars | — | — | 3 of 6 | — | 5.6 |
| 7 | PITWindows · Mac · Linux · Self-hosted | Two bars | — | — | 3 of 6 | — | 5.6 |
| 8 | Cosmic RayLinux · Self-hosted | One bar | — | — | 1 of 6 | — | 5.4 |
| 9 | Dextool MutateLinux · Self-hosted | One bar | — | — | 1 of 6 | — | 5.4 |
| 10 | mutmutWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.4 |
| 11 | GambitWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.3 |
| 12 | MuJavaWindows · Linux | No signal | — | — | 2 of 6 | — | 5.3 |
| 13 | MuterMac | No signal | — | — | 1 of 6 | — | 5.2 |
| 14 | cargo-mutantsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 15 | go-mutestingNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 16 | LittleDarwinNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 17 | mutatorNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 18 | mutest-rsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 19 | MutineerNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 20 | MutodeNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 21 | MutPyNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 22 | pymuteNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 23 | pytest-gremlinsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 24 | Stryker DashboardWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 25 | muttest-rsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.0 |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which mutation testing tool is ranked first on Freedom251?
ArcMutate is ranked #1 of 25 with a score of 6.6. Mutant is second and Mutatest third.
How many of these have a free plan?
4 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, ArcMutate has the lowest first paid tier we found: $8/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation. Paid placements never change a rank.