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Arize Phoenix

Developer tool

by Arize AI

Open-source platform for tracing, evaluating and experimenting with LLM and agent applications, run locally, via Docker/Kubernetes, or as free Phoenix Cloud instances.

Find alternatives to Arize Phoenix

Self-hosted software is free and open source under an ELv2 license (10k+ GitHub stars, github.com/Arize-ai/phoenix). Phoenix Cloud gives 2 free hosted instances with no infrastructure setup; the page discloses no paid Phoenix Cloud tier beyond that free allotment as of 2026-09-04. Independently re-fetched 2026-09-04: page titled 'Phoenix - Arize AI', nav distinguishes 'Phoenix OSS' from 'Arize AX'.

What it does

• Evaluation and observability

Sources

Pricing

Official documentation · 5 Sep 2026

Fetched 2026-09-05, HTTP 200 (arize.com/phoenix 301s to /phoenix/), title 'Phoenix - Arize AI', H1 'Trace the Exponential', 'The open-source platform for agent development and evaluation.' 'OSS Community: ELv2 licensed. 10k+ GitHub stars'; 'Cloud: Get 2 Phoenix Cloud instances for free.' No paid Phoenix tier on the page; arize.com/pricing/ prices only AX.

Sold within

Official documentation · 15 Sep 2026

Live re-check 2026-09-15: the nav distinguishes "Phoenix OSS" from "Arize AX" as separate products, with its own install path requiring no Arize AX purchase; arize.com/pricing confirms Phoenix is a separate open-source, local-first platform.

Name

Official documentation · 5 Sep 2026

Product page title/headline; nav lists it as 'Phoenix OSS' distinct from 'Arize AX'.

Also from Arize AI

• Arize AX Platform

  AI observability platform that traces, evaluates and monitors machine-learning and LLM applications in production, surfacing issues and root causes.

• Arize Database (adb) Infrastructure service

  An AI-native datastore (built on Apache Iceberg) that unifies observability and evaluation data in open formats for zero-copy access across the AI/data stack.

• Alyx AI agent

  AI engineering agent built into Arize AX that reads a project's traces, prompts, datasets and evals and acts on them — investigating issues, improving prompts and running evaluations from a full-page or side-chat surface whose context carries across pages.

Open Arize AI in the directory

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