LangSmith vs Braintrust
LangSmith is stronger at tracing what your app actually did; Braintrust is stronger at evals — proving a change made things better before you ship it.
LangSmith
Free plan
Pick LangSmith if…
You're debugging production behaviour and need the full trace.
Braintrust
Free plan
Pick Braintrust if…
You're iterating on prompts and need scores you can trust.
Side by side
| LangSmith | Braintrust | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Category | Code & Dev | Code & Dev |
| Best known for | Tracing, evals and monitoring for LLM apps in production. | Eval harness for proving a prompt change actually helped. |
| Tags | observability, evals, tracing | evals, testing, observability |
Comparisons are editorial and can't be bought. Pricing models change — check both vendors before deciding. Some links earn a commission; see the disclosure.