# Phoenix Arize

> Open-source AI observability and evaluation

Phoenix by Arize AI is an open-source AI observability platform for LLM and ML applications. It provides traces, evaluations, datasets, and experiments to help teams debug, monitor, and improve their AI systems with full visibility into model behavior.

## Quick facts

- Categories: Developer Tools
- Pricing: Freemium (free plan + paid tiers)
- Free plan: Yes
- Official site: https://arize.com/phoenix/
- Last checked: 2026-10-23

## Key features

- Open-source and self-hostable
- LLM and ML tracing
- Experiment and evaluation tracking
- Dataset management
- Prompt playground
- Cloud and local deployment

## Use cases

- Debugging LLM application issues
- Open-source AI observability
- Evaluating AI system quality
- Research on AI behavior

## Links

- Nextool.ai page: https://nextool.ai/tools/phoenix-arize/
- Alternatives: https://nextool.ai/alternatives/phoenix-arize/

Source: Nextool.ai (https://nextool.ai/tools/phoenix-arize/). Pricing and features change; confirm on the provider's site before relying on them.