# Arize Phoenix vs Langfuse

Arize Phoenix is free, with no paid plan attached. Langfuse is freemium — a usable free tier with paid plans above it.

| | Arize Phoenix | Langfuse |
|---|---|---|
| Pricing | Free | Free tier + paid plans |
| 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) | Fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS |

## FAQ

### Arize Phoenix vs Langfuse: 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). Langfuse is freemium — a usable free tier with paid plans above it and is listed for fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS. Both sit in LLM Eval & Observability.

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

Arize Phoenix is the cheaper starting point: it is free, with no paid plan attached, while Langfuse is freemium — a usable free tier with paid plans above it. Pricing tiers here come from the catalog, not from a promotional page.

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

Choose Arize Phoenix if you need fully open-source, self-hostable with zero setup via `uvx` (pip/conda also supported); choose Langfuse if you need fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS. 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)
- [Langfuse](https://aitools.flocci.in/tool/langfuse)
- [Arize Phoenix alternatives](https://aitools.flocci.in/alternatives/arize-phoenix)
- [Langfuse alternatives](https://aitools.flocci.in/alternatives/langfuse)
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Source: Flocci AI Tools — https://aitools.flocci.in/compare/arize-phoenix-vs-langfuse

Facts last verified: October 2026