17.1
fast-check is a property-based testing library for JavaScript and TypeScript.
Free planOpen sourceWebAPILinux
Best Property-Based Testing Tools in 2026
Property-based testing tools let you exercise code with generated inputs, helping explore behavior across many possible cases. Compare supported languages and test runner support, then consider cases per run, failing-case shrinking, and reproducible failures for how each tool helps you investigate unexpected results. Stateful testing can matter when behavior depends on sequences of actions. Free plan availability…
26.6
ScalaCheck is a free Scala library for automated property-based testing of Scala and Java programs.
Free planLinuxmacOSWindows
36.4
Gopter is a free Go module for property-based testing.
Free planLinuxSelf-hosted
- 4
JSVerify
JSVerify is a free, open-source property-based testing library for JavaScript, inspired by QuickCheck.
Free planWebSelf-hosted6.4Free plan - 5
Racket QuickCheck
Racket QuickCheck is a free package for testing program specifications against randomly generated inputs.
Free planLinuxmacOSWindows6.4Free plan - 6
FsCheck
FsCheck is a free library for automatically checking properties of .NET programs against randomly generated inputs.
Free planLinuxmacOSWindows6.3Free plan - 76.0Free plan
- 86.0Free plan
- 9
PropCheck
PropCheck is a Ruby library for property-based testing: it generates inputs and checks whether assertions hold across examples.
Free planLinuxSelf-hosted5.9Free plan - 10
QuickTheories
QuickTheories is a free property-based testing library for Java 8, described as a Java version of QuickCheck.
Free planAPISelf-hosted5.9Free plan - 11
CsCheck
CsCheck is a free C# library for random testing, inspired by QuickCheck and intended for self-hosted use.
Free planSelf-hosted5.7Free plan - 12
QuickCheck
QuickCheck is a free Haskell library for testing program properties with randomly generated cases.
Free planLinux5.7Free plan - 135.7Free plan
- 145.7
- 15
PropEr
PropEr is a free, open-source tool for automated, semi-random property-based testing of Erlang programs.
Free planSelf-hosted5.6Free plan - 16
Rantly
Rantly is a free, self-hosted Ruby library for generating random test data and running property-based checks.
Free planSelf-hosted5.6Free plan - 17
Rapid
Rapid is a Go library for property-based testing: it checks user-defined properties against test cases generated automatically.
Free planSelf-hosted5.6Free plan - 18
StreamData
StreamData is a free Elixir library for generating data and writing property-based tests with ExUnit.
Free planAPI5.6Free plan - 19
test.check
test.check is a free property-based testing tool for Clojure and ClojureScript.
Free planAPI5.6Free plan - 20
FSharp.Hedgehog
FSharp.Hedgehog is a free property-based testing system for .NET that generates inputs to help developers find edge cases.
LinuxmacOSWindows5.5 - 215.5
- 22
RapidCheck
RapidCheck is a free C++ framework for property-based testing: it generates random inputs and runs specified properties to search for cases that disprove them.
LinuxSelf-hostedWindows5.5 - 235.4
- 24
Eris
Eris is a free, self-hosted PHP library that brings QuickCheck-style property-based testing to PHPUnit.
Self-hosted5.3 - 25
jqwik
jqwik is a free, open-source property-based testing library for JVM programmers using Java, Kotlin, or Groovy.
5.3