A agentindex
Comparison

Braintrust vs LangSmith

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Braintrust

Evals and prompt playground for serious teams.

  • + Excellent eval and scoring UX
  • + Strong for prompt-engineering-heavy teams
  • − Proprietary platform
  • − Self-host story limited

LangSmith

LangChain's observability and eval platform.

  • + Best-in-class when you already use LangChain
  • + Strong tracing UX
  • − Proprietary and cloud-only
  • − Vendor lock-in to LangChain
Spec Braintrust LangSmith
Category eval-observability eval-observability
License Proprietary Proprietary
Open source No No
Self-hostable No No
MCP support No No
Pricing freemium freemium
Starting price Free tier Free developer tier
Models multi multi
Languages python, typescript python, typescript
GitHub stars — —
Last activity — —