Testing & monitoringFree tier

LangSmith

by LangChain

Tracing, testing and monitoring for AI apps.

Prices and features change often — check the official site for current plans. This listing is not an endorsement.

Best for

Teams already using LangChain.

How to choose · Testing & monitoring

Look for full traces, easy dataset building from real failures, and the ability to export your data.

Learn to use tools like this

Open-source tracing and testing for AI apps, which you can host yourself.

Open-source tools to trace and evaluate AI apps.

A platform for testing AI quality and tracking changes.

Logs and monitors your AI calls to track cost and usage.