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Phoenix

Phoenix Arize is an open-source AI observability platform for LLMs.

5.0 / 5 — 4 reviews

About Phoenix

Phoenix Arize is an open-source AI observability platform designed to trace, evaluate, and optimize language model (LLM) applications. Built on OpenTelemetry, it is vendor, framework, and language agnostic, providing flexibility and comprehensive visibility into the inner workings of AI applications. It supports pre-deployment evaluation and troubleshooting directly from a local machine, making it ideal for early-stage developers.

Key Features

  • Performance tracing
  • dashboards
  • LLM evaluation library
  • span-level visibility
  • prompt playground.

Use Cases

  • Troubleshooting LLM applications
  • optimizing prompt templates
  • reducing hallucinations
  • evaluating RAG relevance
  • monitoring AI performance.

Demo Video

Video Reviews

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User Reviews 4

Hamel Husain

Founder, Parlance Labs

I always get asked what my favorite Open Source eval tool is. The most impressive one thus far to me is Phoenix.

2026-06-03

Jerry Liu

CEO and Co-Founder, LlamaIndex

As LLM-powered applications increase in sophistication and new use cases emerge, deeper capabilities around LLM observability are needed to help debug and troubleshoot. We're pleased to see this open-source solution from Arize, along with a one-click integration to LlamaIndex, and recommend any AI engineers or developers building with LlamaIndex check it out.

2026-06-03

Yuki Waka

Application Developer, Klick

Phoenix integrated into our team's existing data science workflows and enabled the exploration of unstructured text data to identify root causes of unexpected user inputs, problematic LLM responses, and gaps in our knowledge base.

2026-06-03

Tom Matthews

Machine Learning Engineer, Unitary.ai

This is something that I was wanting to build at some point in the future, so I'm really happy to not have to build it. This is amazing.

2026-06-03

Frequently Asked Questions

Phoenix is a Data Analysis AI tool for the Technology industry. Phoenix Arize is an open-source AI observability platform for LLMs.

Phoenix uses a Freemium pricing model. It offers a free tier with optional paid upgrades for advanced features. Visit the website for the latest pricing.

  • Performance tracing
  • dashboards
  • LLM evaluation library
  • span-level visibility
  • prompt playground.

Phoenix was created by Arize AI. You can visit their website at https://phoenix.arize.com/.
Phoenix preview

Details

  • Category: Data Analysis
  • Industry: Technology
  • Access: Open Source
  • Pricing: Freemium
  • Created By: Arize AI

Links

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