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Phoenix

Free

Open-source observability for LLMs, embeddings, and retrieval.

Open SourceAPISelf-hostedPython SDK

Tool Info

Categories
Observability · Evaluation
Developer
Arize AI
License
Open Source
Official Website
phoenix.arize.com
Repository
Arize-ai/phoenix
Official Docs

Overview

Phoenix by Arize AI helps debug and evaluate LLM and RAG applications.

Provides embedding visualization and retrieval analysis.

Pricing

Free tier available
Free (open source)

Pros

  • Strong RAG eval focus
  • Open source
  • Visual trace explorer

Best For

RAG evaluationEmbedding analysisLLM trace debugging

When NOT to Use

  • Python-centric
  • Less prompt management than LangFuse

Community Insights

Real implementation experiences shared by AI practitioners.

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Related Tools

LangFuse
Open-source LLM engineering platform for tracing, evals, and analytics.
MLflow
Open platform for the ML lifecycle — experiments, models, and deployment.

Alternatives

LangFuse
Open-source LLM engineering platform for tracing, evals, and analytics.

Tags

#observability#evals#rag

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