📖 The AI Tool Bible

Braintrust vs Promptfoo

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
Braintrust
Evaluation
Promptfoo
Evaluation
TaglineEval, monitor, and improve AI products end-to-end.Open-source eval and red-teaming framework for LLM apps, prompts, and RAG pipelines.
CategoryEvaluationEvaluation
PricingFreemium· Free up to 1k events/day; team from $249/moFreemium· Open-source free; Enterprise SaaS contact sales
ModelPlatform (any LLM)Multi-model
Editorial score8.9 / 10—
Use cases
evalsmonitoringprompt management
llm-evalsred-teamingprompt-regressionrag-testingai-securityci-cd-guardrails
Pros
  • Full eval + observability in one tool
  • Excellent UX
  • Strong dataset/experiment tracking
  • Closed loop dev → prod
  • Genuinely open source and self-hostable, not a fake-OSS funnel
  • Model-agnostic; works across OpenAI, Anthropic, local, custom APIs
  • Red-teaming covers prompt injection, jailbreaks, PII, policy violations
  • Clean CI integration with GitHub/GitLab/Jenkins for regression catching
  • Large community and Fortune-500 adoption signal staying power
Cons
  • Team pricing is steep
  • Smaller than LangSmith ecosystem-wise
  • YAML-heavy config has a learning curve for non-engineers
  • Enterprise pricing is opaque (contact sales only)
  • Red-team scans can be slow and token-expensive at scale
Websitewww.braintrust.devpromptfoo.dev
Pick Braintrust if
  • ✅ Full eval + observability in one tool
  • ✅ Excellent UX
  • ✅ Strong dataset/experiment tracking
  • ✅ Closed loop dev → prod
Pick Promptfoo if
  • ✅ Genuinely open source and self-hostable, not a fake-OSS funnel
  • ✅ Model-agnostic; works across OpenAI, Anthropic, local, custom APIs
  • ✅ Red-teaming covers prompt injection, jailbreaks, PII, policy violations
  • ✅ Clean CI integration with GitHub/GitLab/Jenkins for regression catching
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