Arize Phoenix

Arize Phoenix is an open-source AI observability platform for tracing, evaluating, and experimenting with LLM applications and AI agents. Built on OpenTelemetry standards, it offers distributed tracing, LLM-as-judge evaluations, prompt management, and a model comparison playground. Phoenix runs locally or can be deployed on Docker, Kubernetes, or Arize's managed cloud at app.phoenix.arize.com.