fast-check
7.1#1 in property-based testing toolsFree planFree planWebAPILinuxSelf-hosted
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Hypothesis
5.5#21 in property-based testing toolsLinuxmacOSWindows
VisitWhat both publish
| Fact | fast-check | Hypothesis |
|---|---|---|
| Integrations | The ecosystem lists official integrations for AVA, Jest, and Vitest, along with connectors for libraries such as Zod and io-ts. | First-party extras include integrations for specific packages, and the documentation gives Django as an example installable extra. |
fast-check plans
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Hypothesis plans
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Pick fast-check if…
It suits JavaScript and TypeScript developers who want to check behavior across generated inputs, including stateful scenarios. Its runner-agnostic design can fit projects using a range of test runners.
Pick Hypothesis if…
Hypothesis suits Python developers who want to specify acceptable behavior and let generated inputs probe their code. It is useful when tests need reproducible failures or sequences for stateful behavior.