Pricing type: Free
A mutation testing tool for Python 3.3+ source code
See the website


MutPy is a Python mutation testing framework that can be used jointly with the UNITTEST, PYTEST, and NOSETEST frameworks. MutPy can mutate Python source code files using different mutation operators, such as arithmetic, bitwise, boolean, comparison, exception handling, logical, and unary operators. The framework also enables higher-order mutation testing, which involves applying multiple mutations to the same code element. MutPy produces text and XML reports that show the mutation score and the details of each mutant.

Related tools (Automated Checking)

Test your tests with mutation testing.


State of the art mutation testing system, providing gold standard test coverage for Java and the jvm.

BugBugFree with Paid Option

Automate web app testing easier than ever. Without excessive costs. Faster than coding. Free forever.


Taiko is an open source node.js library for testing modern web applications