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.
For teams checking how well their tests catch code changes, mutation testing tools differ in language support, operators, and how they handle results. Compare supported languages and test frameworks with mutation operators, then consider incremental analysis and parallel execution for your workflow. Surviving mutant reports and a mutation quality gate show what reporting and quality controls are listed; free plans and paid-from pricing add cost context. ArcMutate leads the ranking, with PIT and Stryker Mutator next among the named entries. Infection, Mutatest, Cosmic Ray, Dextool Mutate, and Mutant also appear near the start. Use the stated criteria to weigh compatibility, execution, and reporting needs.
25 mutation testing tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | App | Score | From | Free plan | Paid from | Supported languages | Test frameworks | Incremental analysis | Parallel execution | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | ArcMutate | 6.4 | $8/mo | Yes | — | Java, Kotlin, Groovy | JUnit 4, JUnit 5, Spring Test, Mockito, MockK, Robolectric | Yes | Yes | View |
| 2 |  Mutant | 6.4 | $20.83/mo | Yes | 30 /mo | Ruby | RSpec, Minitest, Test::Unit | Yes | Yes | View |
| 3 |  Mutatest | 6.3 | Free | Yes | — | Python | pytest | — | Yes | View |
| 4 | Stryker Mutator | 6.3 | Free | Yes | — | JavaScript, TypeScript, C#, Scala | Cucumber, Jasmine, Jest, Karma, Mocha, Tap, Vitest, command runner | Yes | Yes | View |
| 5 | Infection | 5.9 | — | Yes | — | PHP | PHPUnit, PhpSpec, Codeception, Testo | Yes | Yes | View |
| 6 |  Cosmic Ray | 5.8 | — | Yes | — | Python 3 | unittest, pytest, nose | Yes | Yes | View |
| 7 |  Dextool Mutate | 5.8 | — | Yes | — | C, C++ | GoogleTest, CTest, Makefile | Yes | Yes | View |
| 8 |  muttest | 5.8 | — | Yes | — | R | testthat; cucumber | Yes | — | View |
| 9 | PIT | 5.8 | — | Yes | — | Java and JVM bytecode | JUnit 3, JUnit 4, TestNG; JUnit 5 via plugin | Yes | Yes | View |
| 10 |  cargo-mutants | 5.4 | — | — | — | Rust | cargo test; cargo nextest | Yes | Yes | View |
| 11 |  mutator | 5.4 | — | Yes | — | R | testthat; tinytest; generic installed-tests fallback | — | Yes | View |
| 12 |  Mutineer | 5.4 | — | — | — | JavaScript, TypeScript | Vitest, Jest | Yes | Yes | View |
| 13 |  pytest-gremlins | 5.4 | — | — | — | Python | pytest | Yes | Yes | View |
| 14 |  MuJava | 5.3 | — | Yes | — | Java | JUnit | — | — | View |
| 15 |  Muter | 5.3 | — | — | — | Swift | Xcode test targets; Swift Package Manager tests | Yes | — | View |
| 16 |  mutmut | 5.3 | — | — | — | Python | pytest | Yes | Yes | View |
| 17 |  pymute | 5.3 | — | Yes | — | Python | pytest; tox | — | Yes | View |
| 18 |  Gambit | 5.2 | — | Yes | — | Solidity | — | — | — | View |
| 19 |  go-mutesting | 5.2 | — | — | — | Go | Go package tests | — | — | View |
| 20 |  LittleDarwin | 5.2 | — | Yes | — | Java | — | — | — | View |
| 21 |  mutest-rs | 5.2 | — | — | — | Rust | Cargo test | — | Yes | View |
| 22 |  Mutode | 5.2 | — | — | — | JavaScript | — | — | Yes | View |
| 23 |  MutPy | 5.2 | — | — | — | Python 3.3+ | unittest; pytest (experimental) | — | — | View |
| 24 | Stryker Dashboard | 5.2 | — | Yes | — | JavaScript, TypeScript, C#, Scala, and other languages supported by compatible mutation-testing frameworks | — | Yes | — | View |
| 25 |  muttest-rs | 5.1 | — | — | — | Rust | Rust/Cargo tests | — | — | View |
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 Samsung Mobile US Press?
ArcMutate is ranked #1 of 25 with a score of 6.4. 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 mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.