Arize Phoenix
Arize's source-available AI observability platform for tracing, evaluation, datasets and experiments.
Sources and review
Checked against public documentation on . Suitability guidance is our editorial judgment; this is not a performance benchmark or an endorsement.
Teams that want self-hosted tracing and evals built on OpenTelemetry standards.
You need an OSI open-source licence; Phoenix uses the Elastic License 2.0, which restricts offering it as a managed service.
About Arize Phoenix
Arize Phoenix is an AI observability platform for experimentation, evaluation and troubleshooting. It traces LLM applications with OpenTelemetry-based instrumentation, runs LLM-based response and retrieval evaluations, manages versioned datasets and experiments, provides a prompt playground and prompt management, and includes an AI agent for debugging traces. It runs locally or self-hosted; Arize AX is the company's managed product.
Arize Phoenix is a project written primarily in Python, with 12k stars on GitHub. It was last updated in September 2026.
pip install arize-phoenix
