AI Observability

Trace, evaluate, and monitor LLM calls, agent steps, and production workflows.

**Provider:** [Langfuse](https://langfuse.com)

**Pricing:** Free self-hosted tier; managed cloud from $49/month

**Best for:** Teams running agents in production that need tracing, evals, and cost monitoring

Langfuse captures every LLM call, tool invocation, and agent step. It supports prompt versioning, evaluation datasets, and cost tracking across providers.