# Arize Phoenix

Fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported). Arize Phoenix is free, with no paid plan attached, at phoenix.arize.com.

## Facts

- **Pricing tier:** Free
- **Works on:** Self-hosted, Web, API
- **Works in browser:** Yes

## Capabilities

- Fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported)
- Combines tracing, evals, datasets, experiments and prompt playground in one local-first tool
- AI engineering agent (PXI) built in for automated troubleshooting of traces

## FAQ

### What is Arize Phoenix?

Arize Phoenix is listed under LLM Eval & Observability, in the AI Models & Local Execution category on Flocci AI Tools. Fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported). It is free, with no paid plan attached, and it lives at phoenix.arize.com.

### Is Arize Phoenix free?

Arize Phoenix is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 396 entries on Flocci AI Tools with no upgrade path built in.

### Can I use Arize Phoenix in a browser, or is there an app?

Arize Phoenix works in a normal browser tab with no install. It is available on self-hosting, the web and an API.

### What can Arize Phoenix do?

Arize Phoenix does 3 things the catalog singles out: Fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported); combines tracing, evals, datasets, experiments and prompt playground in one local-first tool; ai engineering agent (pxi) built in for automated troubleshooting of traces.

### What is the best free alternative to Arize Phoenix?

Google Stax is the closest free alternative: it sits in the same LLM Eval & Observability sub-category and is free. Laminar, DeepEval and EleutherAI LM Evaluation Harness also start free. The full list is on the alternatives page.

## Related

- [Arize Phoenix alternatives](https://aitools.flocci.in/alternatives/arize-phoenix)
- [LLM Eval & Observability](https://aitools.flocci.in/category/ai-models-local-execution/llm-eval-observability)
- [Best free LLM evaluation and observability tools](https://aitools.flocci.in/best/best-llm-eval-observability)
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Source: Flocci AI Tools — https://aitools.flocci.in/tool/arize-phoenix

Facts last verified: October 2026