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Honest pros, cons, and verdict on this ai evaluation tool
✅ Truly local — prompts and datasets never leave your machine
Starting Price
Free
Free Tier
No
Category
AI Evaluation
Skill Level
Developer
Open-source CLI and library for testing, evaluating, and red-teaming LLM prompts, models, and RAG pipelines — runs locally on your machine or in CI.
Promptfoo is an open-source tool that has become the most popular CLI for evaluating LLM prompts and applications. You write a YAML config that lists prompts, providers, test cases, and assertions and Promptfoo runs the matrix locally, caches results, and shows a web UI diff between configurations.
per month
per month
per month
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Learn more →Promptfoo delivers on its promises as a ai evaluation tool. While it has some limitations, the benefits outweigh the drawbacks for most users in its target market.
Open-source CLI and library for testing, evaluating, and red-teaming LLM prompts, models, and RAG pipelines — runs locally on your machine or in CI.
Yes, Promptfoo is good for ai evaluation work. Users particularly appreciate truly local — prompts and datasets never leave your machine. However, keep in mind yaml configs get unwieldy for very large eval suites without discipline.
Promptfoo starts at Free. Check their pricing page for the most current rates and features included in each plan.
Promptfoo is best for Engineering teams testing prompt and model changes in CI and Security teams red-teaming LLM applications before launch. It's particularly useful for ai evaluation professionals who need prompt and model evaluation.
Popular Promptfoo alternatives include Braintrust, LangSmith, Humanloop. Each has different strengths, so compare features and pricing to find the best fit.
Last verified March 2026