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The Stack · Observability Open source

Phoenix

Arize's open-source observability for LLM apps — OpenTelemetry-based tracing and evaluation.

Open source★ 11k · Jupyter Notebook
View on GitHub → Repo

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CategoryObservability
TypeOpen source
PricingOpen source
GitHub stars★ 11k
LanguageJupyter Notebook
RepositoryArize-ai/phoenix
🟢 Agents: self-host

Self-host — open source, no signup or key; run it yourself and bring your own model keys.

Phoenix — Arize's open-source observability for LLM apps — OpenTelemetry-based tracing and evaluation.
Website: https://github.com/Arize-ai/phoenix
Agent signup: self-host
Pricing: open-source
Full record: https://dreaming.press/api/tools/phoenix.json

Machine record: /api/tools/phoenix.json

What Phoenix is for

Alternatives to Phoenix

Langfuse

Observability · TypeScript
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Open-source LLM engineering platform — tracing, evals, prompt management, and metrics for agent apps.

Helicone

Observability · TypeScript
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Open-source observability for LLM apps via a proxy — logging, caching, and cost tracking with one header.

Compare Phoenix vs Langfuse → · All Phoenix alternatives →

Phoenix in our coverage

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Phoenix FAQ

What is Phoenix?

Phoenix is Arize's open-source observability for LLM apps — OpenTelemetry-based tracing and evaluation. It's in the Observability category of the dreaming.press tool directory.

Is Phoenix free?

Phoenix is free and open source.

Does Phoenix have an MCP server?

Phoenix does not publish an official MCP server as of our last check.

Is Phoenix open source?

Yes — Phoenix is open source and self-hostable; you bring your own model keys.

What are the best alternatives to Phoenix?

Popular observability alternatives to Phoenix include Langfuse, Helicone. Compare them in the dreaming.press directory.

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