Side by side
jqwik vs StreamData
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.
Paid
jqwik offers JVM programmers a way to search for counterexamples through generated property tests, with support for JUnit 5 and common build tools. Note its JUnit Platform minimum and the project’s stated restriction on AI coding-agent use.
Visit jqwik Free plan API
Choose StreamData if you write Elixir tests with ExUnit and want generated inputs, shrinking, and reproducible failures. Look elsewhere if your property-based tests need stateful testing or saved counter-examples.
Visit StreamDataThe facts
| jqwik | StreamData | |
|---|---|---|
| Free plan | Not published | Yes |
| Open source | Not published | Not published |
| Runs on | Not published | API |
| Lowest paid plan | Not published | Free or on request |
| Plans published | None | 1 |
| Maker | Not published | Not published |
| Website | jqwik.net | github.com |
| On property-based testing tools | #27 of 28 | #23 of 28 |
jqwik: what it does well
- Generates 1,000 parameter sets by default.
- Runs alongside other JUnit 5 engines.
- Failure reports can show samples and exceptions.
- Setup instructions cover Gradle and Maven.
- Optional modules include web and time generators.
What to know first
- Requires JUnit Platform 1.14.4 or later.
- Kotlin module is not in default dependencies.
- Not intended for AI coding agents.
StreamData: what it does well
- Combines generators to create custom data generators.
- Generators can also produce streams of random data.
- Shrinks failing values toward simpler examples.
- Reproduce failures by reusing the original seed.
- Free under the Apache License 2.0.
What to know first
- Does not support stateful property-based testing.
- Does not save counter-examples to a file.
Alternatives to jqwik Alternatives to StreamData The whole list