Side by side
CsCheck vs fast-check
Both stand on property-based testing tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Self-hosted
CsCheck offers a broad set of generated and stateful testing approaches, with shrinking and reproducibility built in. Developers considering AOT use should account for the stated generic-recursion limitation.
Visit CsCheck
Free plan Open source APILinuxSelf-hosted+1
fast-check offers a configurable property-based testing workflow with failure shrinking and broad test-runner support. Its version 5.x runtime requirements may affect adoption in older environments.
Visit fast-checkThe facts
| CsCheck | fast-check | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Self-hosted | API, Linux, Self-hosted, Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | github.com | fast-check.dev |
| On property-based testing tools | #3 of 28 | #1 of 28 |
CsCheck: what it does well
- Automatic shrinking is supported without Arb classes.
- Shrunk cases include seeds for reproducing failures.
- Supports stateful, parallel, and specification testing.
- Faster statistically compares method performance.
- The project states that no reflection was used.
What to know first
- Generic recursion limits AOT compatibility.
- The Dbg API may change between minor versions.
- It is intended for self-hosted use.
fast-check: what it does well
- Free and released under the MIT license
- Works with several test runners
- Shrinks failing inputs to counterexamples
- Supports seeds and reproducible failures
What to know first
- Version 5.x requires Node.js 22.12.0 or later
- Version 5.x requires ECMAScript 2025
Alternatives to CsCheck Alternatives to fast-check The whole list