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Evals and prompt testing
The best eval tool for catching prompt and model regressions is Promptfoo because it scores highest on our published formula (78.2/100): Open-source eval and red-teaming CLI. The Community edition is free.
The job: “I want automated tests that catch prompt and model regressions.” · Last checked
Promptfoo
Open-source eval and red-teaming CLI. The Community edition is free.
Not for: People who want a pure Python-library workflow.
Pricing: Community edition free forever (open source); paid team plans. source, checked 2026-10-19
Visit Promptfoo ↗DeepEval
Open-source, pytest-style eval library for Python.
Not for: Non-Python stacks.
Pricing: Open source library. source
Score breakdown
| Tool | Fit (editorial) ×0.4 | Adoption (GitHub stars) ×0.25 | Momentum (release freshness) ×0.2 | Attention (HN, 30d) ×0.15 | Score |
|---|---|---|---|---|---|
| Promptfoo | 5/5 → 1 | 26.2k★ → 0.828 | Oct 8, 2026 → 0.874 | 0 pts → 0 | 78.2 |
| DeepEval | 4/5 → 0.75 | 19.0k★ → 0.801 | Oct 16, 2026 → 0.966 | 0 pts → 0 | 69.3 |
Missing signals are dropped and the remaining weights re-normalized. See methodology. Signals fetched Oct 19, 2026.
FAQ
What is the best eval tool for catching prompt and model regressions?
The best eval tool for catching prompt and model regressions is Promptfoo because it scores highest on our published formula (78.2/100): Open-source eval and red-teaming CLI. The Community edition is free.
What is the best alternative to Promptfoo?
Our runner-up is DeepEval (69.3/100). Open-source, pytest-style eval library for Python. Not for: Non-Python stacks.
Who should not use Promptfoo?
People who want a pure Python-library workflow.
How much does Promptfoo cost?
Community edition free forever (open source); paid team plans. (checked 2026-10-19, source: https://www.promptfoo.dev/pricing/)
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