LangSmith

Name: LangSmith
Author: LangChain

Tracing, evaluation, and monitoring from the LangChain team.

Why it's indexed

Framework-agnostic despite the name, with the deepest LangGraph integration.

Editorial judgement, not a measurement — see our methodology. Listing is never paid for.

Pricing is shown as a model, not a rate. Published rates change without notice — check the vendor's own page before budgeting.

Open-source LLM tracing, evaluation, and prompt management.

Open-source, OpenTelemetry-native tracing and evaluation for LLM apps.

Evaluation-first platform for shipping LLM changes with measured confidence.