LangSmith is the observability and evaluation platform from LangChain for teams building LLM applications, with or without the LangChain framework. It records full traces of each model call and chain step with cost, latency, and token breakdowns, and layers structured evaluation workflows and a prompt playground on top. Integration comes via SDKs and OpenTelemetry. A free Developer plan covers one seat with a monthly trace allowance; the Plus plan is priced per seat with usage-based trace billing beyond the included volume. Self-hosted deployment is reserved for the Enterprise plan.
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Overview
- Founded
- 2022
- Pricing tier
- Mid
- Startup-friendly
- Yes
- Enterprise-ready
- Yes
LLM observability
- Request tracing
- Yes
- Quality evals
- Yes
- Prompt management
- Yes
- LLM gateway
- No
- Open-source
- No
- Self-hostable
- Yes
- Free tier
- Yes: Developer plan: 1 seat, 5k base traces/mo