fast-check vs Rantly
| fast-check | Rantly | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | Free | — |
| Open source | No | No |
| Platforms | api, Linux, Web | — |
| Free plan | Yes | Yes |
| Supported languages | JavaScript, TypeScript | Ruby |
| Test runner support | Jest, Mocha, Vitest, Ava, Bun, Deno, Node.js test runner | Test::Unit, Minitest, RSpec |
| Failing-case shrinking | Yes | Yes |
| Stateful testing | Yes | — |
| Reproducible failures | Yes | — |
Both are listed in Best Property-Based Testing Tools. On Samsung Mobile US Press, fast-check scores higher on our published basis.