freemium observability Engineers
LangSmith
by LangChain
An observability and evaluation platform for LLM applications, from the makers of LangChain.
4/5
Visit LangSmith Pros
- + Detailed tracing of LLM and agent runs
- + Built-in evaluation and dataset tooling
- + Works with or without LangChain
Cons
- − Closed source and cloud-first
- − Costs scale with trace volume
- − Most powerful when paired with LangChain
What Is LangSmith
LangSmith is an observability and evaluation platform for applications built on large language models. It traces every step of a chain or agent so you can see what actually happened.
In Practice
Teams use LangSmith to debug why an agent failed, track latency and cost, run evaluations against datasets, and monitor production behavior. It integrates tightly with LangChain but supports any LLM application.