No test code to write
Breakspec suggests rules in plain English, and writes the test code for the ones you approve.
Compare · Checked 12 October 2026
Breakspec vs Writing property tests yourself
Property-based testing means writing a rule your code must always follow, then letting a library like Hypothesis try hundreds of inputs to break it. Breakspec is built on exactly that: Hypothesis for most languages, and fast-check for TypeScript and JavaScript. If your team already writes these tests, keep going. Most teams don’t, because writing them takes time.
What Writing property tests yourself does
- You write the rules, and the code that generates test inputs, yourself, in each language’s library.
- Hypothesis and fast-check are mature. Hegel, from the people behind Hypothesis, brings the same approach to Rust and Go, with more languages on the way.
How Breakspec is different
Everything around the test
Failures go to your agent as a fix request, fixes get checked, every example that ever failed is kept and rerun, and fixes that cheat are flagged.
One tool for every language
The same rules and the same workflow in 14 languages, with your code cut off from the internet while it runs.
| Writing property tests yourself | Breakspec | |
|---|---|---|
| Who writes the rule | A developer, in code | Breakspec suggests it in English, you approve it |
| Who writes the input generators | A developer | Breakspec |
| Code is cut off from the internet while it runs | No | Yes |
| Checks fixes and catches cheating | No | Yes |
What Writing property tests yourself does better
- Full control, and no AI involved at any point.
- Free, open source, and already part of your test runner.
Can I use both?
Yes. And if you want plain tests in the end, Breakspec can export approved rules as ordinary Hypothesis or fast-check tests for Python, TypeScript and JavaScript, which run without Breakspec.
Sources
Checked on 12 October 2026, from Writing property tests yourself’s own docs and pricing pages. Prices and features change; if something here is out of date, tell us at sales@breakspec.com and we’ll fix it.
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