LangWatch

Teams running LLM applications in production use LangWatch to see what their prompts, variables, tool calls and agents are actually doing.

LangWatch is an LLM observability and evaluation platform that monitors, evaluates and optimizes LLM-powered apps, with support for major AI frameworks.

Evaluation runs both offline and online.

You can write checks as LLM-as-a-Judge prompts or as code-based tests, then keep running them on live traffic to catch regressions.

Monitoring adds automated anomaly detection, alerting and root cause analysis, so you find a problem before users report it.

LangWatch also has annotations, labeling and experimentation features, which suit teams that want human review next to automated scoring.

It is made for developers and AI teams, not casual users of chat tools.