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Tech riderRev. 3 Oct 2026

Rapid

Ch 096.5of 27 Property-Based Testing Tools
  1. 1Runs onself-hosted
  2. 2CostsFree plan
  3. 3Supported languagesGo
  4. 4Test runner supportGo testing package; go test
  5. 5Failing-case shrinkingYes
  6. 6Stateful testingYes
  7. 7Reproducible failuresYes
7 lines stated Written from the maker's own pages: pgregory.net, github.com
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The Rapid homepage

Overview

Rapid is ranked #9 of 27 in property-based testing tools on Specifiction. It runs on Self-hosted. There is a free plan.

Rapid plans and pricing

All plans
Rapid Free Open-source Go library · No dependencies outside the Go standard library github.com · 3 Oct 2026

Compared on property-based testing tools

Free plan
Yespgregory.net
Supported languages
Gopgregory.net
Test runner support
Go testing package; go testpgregory.net
Failing-case shrinking
Yespgregory.net
Stateful testing
Yespgregory.net
Reproducible failures
Yespgregory.net

Facts

What it does
Rapid is a Go library for property-based testing that checks user-defined properties against automatically generated test cases.github.com · 3 Oct 2026
Automatic minimization
When a failure is found, Rapid automatically minimizes the failing test case before presenting it.github.com · 3 Oct 2026
Data generation
Its type-safe generators use generics and bias data generation toward small values and edge cases.github.com · 3 Oct 2026
Failure persistence
Rapid supports persisting minimized failing test cases and automatically rerunning them.github.com · 3 Oct 2026
Dependencies
Rapid has no dependencies outside the Go standard library.github.com · 3 Oct 2026
Fuzzing integration
The MakeFuzz function lets a Rapid test be used as a fuzz target for Go's standard fuzzer.github.com · 3 Oct 2026
Usage
Rapid tests run with the standard go test command.github.com · 3 Oct 2026
Configuration
Rapid's options can be set with flags prefixed -rapid. or corresponding RAPID_ environment variables.github.com · 3 Oct 2026
Stability
The project says tests should continue to work across future releases with the same major version, subject to stated API-change exceptions.github.com · 3 Oct 2026
License
Rapid is licensed under the Mozilla Public License Version 2.0.github.com · 3 Oct 2026
Comparison limit
Compared with Go's testing.F.Fuzz, Rapid describes itself as better suited to structured data and state machine tests, while lacking coverage-guided feedback and mutations.github.com · 3 Oct 2026

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Where it ranks on Specifiction

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