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Promptfoo

Testing platform for evaluating prompt performance and analyzing LLM outputs.

Our take: It is a developer-first standard for LLM testing: declarative configs, side-by-side model comparison, CI/CD integration and security red-teaming, running 100% locally so prompts never leave your machine (used by OpenAI and Anthropic).

Best forDevelopers
ReviewedPricing: Paid
8.1 out of 105 criteria · see breakdown
Try PromptfooFree (MIT); Enterprise custom
The bottom line

The leading free, open-source tool for LLM evals and red-teaming; powerful and local, with paid enterprise only for team governance and scale.

Our score

Reviewed by the Conversion Gems editorial team. Hover a facet to focus it; click to pin.Tap a facet to focus it.

What it is, and why we rate it

One line each. Open a row for detail.

What it really isAn open-source CLI and library for evaluating and red-teaming LLM apps - testing prompts, models, RAG and agents, plus vulnerability scanning - not a $19/mo SaaS.
Our takeIt is a developer-first standard for LLM testing: declarative configs, side-by-side model comparison, CI/CD integration and security red-teaming, running 100% locally so prompts never leave your machine (used by OpenAI and Anthropic).
The free MIT tier is fully featured (including 10k red-team probes/month); only enterprise governance and unlimited probes are paid.

Best / not good for

Best for
  • Developers benchmarking prompts, models and RAG
  • AI teams red-teaming apps for security and vulnerabilities
  • CI/CD pipelines gating LLM quality and safety
Not good for
  • Non-developers wanting a no-code UI
  • Enterprises needing SSO, dashboards and unlimited probes without paying
  • Teams wanting a fully managed, hosted-only service
Trade-offs

Friction report

Trade-offs to know before signing up.

  1. Time to value
    Fast for developers: install the CLI, write a declarative config, and run evals locally or in CI within minutes.
  2. Scale breakpoint
    The free tier caps red-team probes at 10k/month, and team governance (SSO, dashboards, collaboration, unlimited probes) requires custom-priced Enterprise.
  3. Walled garden
    Low lock-in - MIT, model-agnostic and local-first; only enterprise features are proprietary.
Still a fit?
If none of these block you, start on the free plan.
Try Promptfoo

Frequently Asked Questions

What capabilities does Promptfoo provide for AI prompt management?

Promptfoo provides AI prompt management capabilities including testing, evaluation, and optimization.

What is Promptfoo used for in prompt management?

Promptfoo is used for prompt management, allowing users to organize, test, and optimize AI prompts.

What tools does Promptfoo provide for managing AI prompts?

Promptfoo provides tools for managing AI prompts, including versioning, testing, and optimization.

What benefits does Promptfoo provide for prompt testing and management?

Promptfoo provides benefits for prompt testing and management by tracking, evaluating, and optimizing AI prompts.

What benefits does Promptfoo provide for testing and managing AI prompts?

Promptfoo provides benefits for testing and managing AI prompts by tracking performance, evaluating outputs, and organizing prompt libraries.

Alternatives

  • Step up

    An enterprise eval/observability platform like Langfuse or Braintrust with managed dashboards.

  • Lighter alternative

    A provider's built-in eval tooling if you only test one model.

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Tags

#LLMOps#LLMObservability#ModelEvaluation

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