Mutatest is a free command-line tool for Python that checks whether tests catch small changes to code.
Alternatives to Muter
ArcMutate extends PiTest with mutation testing for Java, Kotlin, and Android software.
Mutant is mutation testing software for Ruby.
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MuJava
MuJava is a free, open-source tool for mutation testing Java programs.
Free planLinuxmacOSWindows6.3Free plan - 56.3Free plan
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go-mutesting
go-mutesting is a free, MIT-licensed framework for mutation testing Go code.
Free planLinuxSelf-hosted6.2Free plan - 7
LittleDarwin
LittleDarwin is a Java mutation testing framework written in Python for Linux.
Free planLinux6.2Free plan - 8
MutPy
MutPy is a free, open-source mutation testing tool for Python source code that helps developers check whether their tests detect changes.
Free planLinuxSelf-hosted6.2Free plan - 9
pytest-gremlins
pytest-gremlins is a free, MIT-licensed pytest plugin that checks whether an existing test suite catches small changes to Python code.
Free planLinux6.1Free plan - 10

Infection
Infection is a free PHP mutation-testing library that checks whether a test suite catches changes to source code.
WebLinuxmacOS6.0 - 11
Stryker Dashboard
Stryker Dashboard hosts mutation-testing reports online and provides a mutation score badge for repositories.
Free planWebAPI6.0Free plan - 12

Stryker Mutator
Stryker Mutator assesses how well unit tests catch code changes by introducing mutations and running the tests against the altered code.
Free planAPISelf-hosted5.8Free plan - 135.7
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mutmut
mutmut is an open-source mutation testing system for Python that helps teams check whether their pytest tests catch changes to code.
LinuxmacOSSelf-hostedWindows5.7 - 15
muttest
muttest is an R package for mutation testing: it makes selected changes to code and runs tests to see which changes the test suite catches.
LinuxmacOSWindows5.7 - 16

PIT
PIT is a free mutation-testing tool for Java and JVM bytecode projects.
LinuxmacOSSelf-hostedWindows5.5 - 175.4
- 185.4
- 195.3
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Dextool Mutate
Dextool Mutate is a free mutation-testing tool for C and C++ that checks whether tests detect artificially introduced faults.
LinuxSelf-hosted5.2 - 21
mutest-rs
mutest-rs is a free, open-source Rust tool for checking how effectively a test suite detects code changes.
5.2 - 22
Mutode
Mutode is free, open-source mutation testing software for JavaScript and Node.js projects.
5.2 - 23
muttest-rs
muttest-rs is a free, MIT-licensed Rust tool for evaluating whether tests detect simulated code changes.
5.2 - 24
Mutineer
Mutineer is a free, open-source mutation testing framework for JavaScript and TypeScript.
4.9
