Open source projects using Hypothesis

The following is a non-exhaustive list of open source projects I know are using Hypothesis. If you’re aware of any others please add them to the list! The only inclusion criterion right now is that if it’s a Python library then it should be available on PyPI.

You can find hundreds more from the Hypothesis page at, and thousands on GitHub. Hypothesis has over 100,000 downloads per week, and was used by more than 4% of Python users surveyed by the PSF in 2020.