Phoenix

Open-source, OpenTelemetry-native tracing and evaluation for LLM apps.

Why it's indexed

Built on OpenInference/OpenTelemetry, so traces flow into existing observability rather than a silo.

Editorial judgement, not a measurement — see our methodology. Listing is never paid for.

Pricing is shown as a model, not a rate. Published rates change without notice — check the vendor's own page before budgeting.

Open-source LLM tracing, evaluation, and prompt management.

Tracing, evaluation, and monitoring from the LangChain team.

Evaluation-first platform for shipping LLM changes with measured confidence.