CsCheck

CsCheck is ranked #5 of 27 in property-based testing tools on The Geeks Club. It runs on Self-hosted. There is a free plan.

CsCheck plans and pricing

CsCheck Free Apache 2 · free forever github.com · 4 Oct 2026

Compared on property-based testing tools

Free plan: Yes
Supported languages: C#, F#
Test runner support: TUnit; any testing framework
Failing-case shrinking: Yes
Stateful testing: Yes
Reproducible failures: Yes

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CsCheck

Product: CsCheck is a C# random testing library inspired by QuickCheck.
Generators: Its composable Gen classes support automatic shrinking without Arb classes.
Reproducibility: Shrunk cases have a seed value that can be used to reproduce a failure.
Testing styles: The library supports random, model-based, metamorphic, performance, specification, regression, parallel, and equality testing.
Concurrency: Parallel testing compares results against possible linearizations and supports shrinking.
Specification checks: Specification testing can exhaustively enumerate a reachable state space or sample it, and can check whether declared faults are caught.
Performance testing: Its Faster function statistically compares whether one method is faster than another and can be run as a normal test across platforms.
Framework support: The README says its example tests use TUnit but could equally be used in any testing framework.
F# usage: The project page reports 1,000+ F# tests using CsCheck in MKL.NET.
Installation: NuGet lists CsCheck 4.9.1 and documents installation with the .NET CLI package command and PackageReference.
AOT caveat: The project says CsCheck is close to being AOT compatible but generic recursion is a limitation.
Security and reflection: The project states that no reflection was used in making CsCheck.
Logging: Sample supports logging types and pass and fail results for analysis, and the project includes a Tyche logging implementation.
Debug utility limitation: The Dbg module is described as temporary debug functionality whose API may change between minor versions.
Price from: Free

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Where it ranks on The Geeks Club

Best Property-Based Testing Tools in 2026#5 of 27

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Sources

github.com/AnthonyLloyd/CsCheck· checked 4 Oct 2026
nuget.org/packages/CsCheck· checked 4 Oct 2026