Directory / Phoenix
Phoenix
Verified
Arize open-source observability and evaluation for LLM applications.
Phoenix is an open-source observability and evaluation tool from Arize: traces, evaluations, and datasets often run as a notebook or local app. Arize AX is the commercial platform, covered separately by its own terms.
- Model support
- Multi-model
- Deployment
- Self-hosted
- Open source
- Yes
- License
- Elastic License 2.0 (read the repo)
- Pricing model
- Mixed
- Added / updated
- 19 Aug 2026 / 19 Aug 2026
phoenix.arize.com · Docs · Source
Assessment
Phoenix is Arize's open observability and evaluation product for self-hosted use. Its Elastic License 2.0 differs from MIT. Arize AX is the separate commercial platform.
Strengths
- Open tracing/eval focused on LLM apps.
- Works locally without buying AX.
- Eval + observability in one tool.
Limitations
- Elastic License is not OSI-casual.
- Commercial platform is a different contract.
- No coding agent.