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📖 The AI Tool Bible

Braintrust vs Respan (formerly Keywords AI)

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

 Braintrust logo
Braintrust
Evaluation
Respan (formerly Keywords AI) logo
Respan (formerly Keywords AI)
Evaluation
TaglineEval, monitor, and improve AI products end-to-end.LLM engineering platform combining a multi-model gateway with tracing, evals, and prompt management.
CategoryEvaluationEvaluation
PricingFreemium· Starter: $0 · Pro: $249 · Enterprise: Custom pricingFreemium· Free tier; paid plans (pricing not public); enterprise on request
ModelPlatform (any LLM)Multi-model (500+ via gateway)
Editorial score8.9 / 107.1 / 10
Use cases
evalsmonitoringprompt management
llm-observabilityprompt-managementmodel-routingevalsproduction-monitoring
Pros
  • Full eval + observability in one tool
  • Excellent UX
  • Strong dataset/experiment tracking
  • Closed loop dev → prod
  • Unified gateway to 500+ models with fallback and error handling
  • End-to-end loop: trace, evaluate, monitor, version prompts in one UI
  • Eval system mixes rules, AI judges, and human review
  • Broad SDK and framework coverage (LangChain, LlamaIndex, Vercel AI SDK)
  • YC-backed with serious production scale (80T+ tokens claimed)
Cons
  • Team pricing is steep
  • Smaller than LangSmith ecosystem-wise
  • Closed source — no self-host option for most customers
  • Paid pricing not transparent on the site
  • Recent rebrand from Keywords AI may cause doc and link churn
  • Gateway dependency adds a network hop and vendor lock-in
Websitewww.braintrust.devwww.respan.ai
Pick Braintrust if
  • ✅ Full eval + observability in one tool
  • ✅ Excellent UX
  • ✅ Strong dataset/experiment tracking
  • ✅ Closed loop dev → prod
Pick Respan (formerly Keywords AI) if
  • ✅ Unified gateway to 500+ models with fallback and error handling
  • ✅ End-to-end loop: trace, evaluate, monitor, version prompts in one UI
  • ✅ Eval system mixes rules, AI judges, and human review
  • ✅ Broad SDK and framework coverage (LangChain, LlamaIndex, Vercel AI SDK)
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