# Arize Phoenix vs DeepEval

Arize Phoenix is free, with no paid plan attached. DeepEval is free, with no paid plan attached.

| | Arize Phoenix | DeepEval |
|---|---|---|
| Pricing | Free | Free |
| Free to start | Yes | Yes |
| Category | AI Models & Local Execution | AI Models & Local Execution |
| Type | LLM Eval & Observability | LLM Eval & Observability |
| Best for | Fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported) | Open-source LLM evaluation framework with pytest-style tests and 50+ metrics |

## FAQ

### Arize Phoenix vs DeepEval: what is the difference?

Arize Phoenix is free, with no paid plan attached and is listed for fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported). DeepEval is free, with no paid plan attached and is listed for open-source LLM evaluation framework with pytest-style tests and 50+ metrics. Both sit in LLM Eval & Observability.

### Is Arize Phoenix or DeepEval cheaper to start with?

Neither — Arize Phoenix and DeepEval are both free, so the choice comes down to capability rather than cost. Both entries list what they uniquely do above.

### Which should I choose, Arize Phoenix or DeepEval?

Choose Arize Phoenix if you need fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported); choose DeepEval if you need open-source LLM evaluation framework with pytest-style tests and 50+ metrics. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.

## Related

- [Arize Phoenix](https://aitools.flocci.in/tool/arize-phoenix)
- [DeepEval](https://aitools.flocci.in/tool/deepeval)
- [Arize Phoenix alternatives](https://aitools.flocci.in/alternatives/arize-phoenix)
- [DeepEval alternatives](https://aitools.flocci.in/alternatives/deepeval)
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Source: Flocci AI Tools — https://aitools.flocci.in/compare/arize-phoenix-vs-deepeval

Facts last verified: October 2026