Open-source CLI and library for testing and evaluating LLM prompts. Run automated evals, red-team your models for safety, and catch regressions before they hit production.
What Is Promptfoo Used For?
Promptfoo is a prompt testing and evaluation framework for LLM applications. It lets you define test cases, run assertions, and compare outputs across models or prompt variants before deploying — catching regressions and hallucinations in CI rather than production.
Heat Score
0–100 viral momentum index combining social buzz, search trends & growth velocity
43
14-day trend
+11
24h
+14
7d
Heat Score Breakdown
Creator Buzz (30%)3
Search Interest (25%)83
Community Discussion (20%)2
Growth Momentum (25%)83
Forecast
Stable
low confidence
Now
43
→
+7 days
20
→
+14 days
34
A.R.C. Score
A.R.C. ratings are calculated for developer infrastructure and API-first tools. This tool hasn't been evaluated yet or falls outside the A.R.C. scope.
🔓Data Lock-In Index
100/ 100
Lower = more portable. 0 = fully open, 100 = maximum lock-in.
✗ Webhooks Out✗ Bulk Export✗ Open Formats
Pricing
free
Best For
Teams & Solo
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