A
Arize Phoenix
Open-source LLM observability with tracing, evaluation, and datasets — 8K+ stars
Open Sourcefreemium Trending
About
Arize Phoenix is an open-source observability platform for LLM applications. It provides tracing for multi-step agent workflows, built-in evaluation with LLM-as-judge and code-based evals, dataset management for experiments, and a visual UI for debugging prompt/response pairs. Phoenix integrates with OpenTelemetry, LangChain, LlamaIndex, and OpenAI, and can run locally or in the cloud.
Details
| Type | observability, evaluation, tracing |
| Integrations | langchain, llamaindex, openai, opentelemetry |
| Language | python |
Tags
observabilitytracingevaluationopen-sourceopentelemetrydebugging
Quick Info
- Organization
- Arize AI
- Pricing
- Free (self-hosted), cloud plans available
- Free Tier
- Yes
- Updated
- Mar 28, 2026
8.5K250.0K/w4d ago120
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