# LangSmith

> LangSmith is LangChain's proprietary platform for tracing, evaluation and monitoring of LLM applications, generally available since February 2024; self-hosting is an Enterprise-only option, and in 2026 it introduced SmithDB, a Rust-based data layer the vendor says delivers a P50 latency of 92ms.

LangChain's proprietary tracing, evaluation and monitoring platform.

- **Category:** Observability
- **License:** Proprietary (platform); LangChain SDKs are MIT
- **Language:** N/A (managed platform)
- **Self-hosted:** No
- **Last verified:** 2026-10-04

> Caveat: Proprietary SaaS; self-hosting is limited to Enterprise agreements. The underlying LangChain/LangGraph SDKs are separately MIT-licensed.

Source: https://agent.c8.fit/tools/langsmith/