LLM Observability & Agent Tracing Platform · Vendor file
Braintrust
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AI evaluation and observability platform with unlimited users, evals-first approach
Active · verified September 2026
Categories Braintrust serves
The B4 Index places Braintrust in 3 categories. Each category page lays out the build-versus-buy considerations for that decision.
LLM Observability & Agent Tracing Platform Primary Free tier. Pro $249/month (unlimited users).
AI Model Evaluation (Evals) Platform Primary Free tier; Pro $249/mo; Enterprise custom
Prompt Management & Engineering Platform Free tier; Pro $249/mo; enterprise custom
Braintrust compared
The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to
classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full
methodology.