---
slug: "arize-phoenix"
name: "Arize Phoenix"
effect: "Traces LLM and agent apps over OpenTelemetry and runs evals, datasets and experiments in a local UI"
category: "eval-observability"
url: "https://arize.com/phoenix/"
github: "Arize-ai/phoenix"
pricing: "free"
license: "Elastic License 2.0 (source-available)"
tags: ["tracing", "evals", "opentelemetry", "self-hosted", "python"]
platforms: ["docker"]
install_kind: "pip"
date_added: "2026-10-14"
drop_score: 63
stars: 11839
pushed_at: "2026-10-15T00:26:42Z"
signals_status: "ok"
signals_fetched_at: "2026-10-15T01:18:54.330Z"
page: "https://agenttooldrop.com/tools/arize-phoenix"
---

# Arize Phoenix

Traces LLM and agent apps over OpenTelemetry and runs evals, datasets and experiments in a local UI

Category: Evals and observability. Pricing: Free. License: Elastic License 2.0 (source-available).

Platforms: docker.

## Why you would want it

Phoenix collects traces through OpenTelemetry-based OpenInference instrumentation, with integrations for frameworks such as the OpenAI Agents SDK, Claude Agent SDK, LangGraph and Vercel AI SDK across Python, JavaScript, Java and Go. On top of traces it offers LLM-based evals, versioned datasets, experiments, a prompt playground and prompt management. It runs locally with `phoenix serve`, in a container or on Kubernetes, and exposes a remote MCP endpoint so Claude Code, Cursor and other MCP clients can query traces, datasets and experiments.

## Best for

- Local trace debugging during development
- OpenTelemetry-based stacks
- Self-hosted eval and experiment tracking

## Use it when

You want an observability and eval UI on your own machine or infrastructure, instrumented with OpenTelemetry rather than a vendor-specific SDK.

## Skip it if

You need an OSI open source license or want to offer it as a hosted service; the Elastic License 2.0 forbids that. For a managed platform Arize points to its separate Arize AX product.

## Editor note

Phoenix is under the Elastic License 2.0, so it is listed as free rather than open-source.

## Install

Install with pip:

```sh
pip install arize-phoenix
phoenix serve
```

Source: https://github.com/Arize-ai/phoenix#readme

## Live signals

Fetched 2026-10-15T01:18:54.330Z (status: ok).

- Repository: Arize-ai/phoenix
- Stars: 11,839
- Forks: 1,203
- Open issues and PRs: 1,150
- License (GitHub): NOASSERTION
- Last push: 2026-10-15
- Latest release: arize-phoenix-v20.21.4 (2026-10-14)

## Links

- Website: https://arize.com/phoenix/
- GitHub: https://github.com/Arize-ai/phoenix
- Install instructions verified at: https://github.com/Arize-ai/phoenix#readme
- Source for this entry: https://github.com/Arize-ai/phoenix#readme
- AgentToolDrop page: https://agenttooldrop.com/tools/arize-phoenix
- Full catalog (JSON): https://agenttooldrop.com/tools.json