AI tools
promptfoo
An open source toolkit for testing, evaluating, and regression-checking LLM prompts and agents.
Open originalWhat it is
promptfoo is a useful bridge between product prompt work and engineering discipline: it makes behavior testable before a change ships.
Why worth a look
An open source toolkit for testing, evaluating, and regression-checking LLM prompts and agents.
Good for
- Turning prompt experiments into repeatable test cases.
- Catching regressions when changing prompts, models, or tools.
How to start
- Write three representative inputs and one clear expected behavior.
- Run a small eval before expanding the test matrix.
Best first click
Open promptfoo and start here: Write three representative inputs and one clear expected behavior.
Trust facts
- Pricing
- Free
- Login required
- No
- Open source
- Yes
- API available
- No
- License
- Open-source license; verify the project repository.
- Risk
- Pricing, login requirements, and availability can change; last human check: 2026-07-08.