Arize Phoenix
Open-source tracing and evaluation for LLM apps.
Updated
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Use cases
About Arize Phoenix
Arize Phoenix is listed in our evals & observability category and is aimed at builders. Open-source tracing and evaluation for LLM apps. Pricing, as the maker states it: Source-available. Maturity: Mature. We last checked the official link on 2026-10-14.
What is Arize Phoenix?
Arize Phoenix is Arize's source-available AI observability platform for experimentation, evaluation and troubleshooting.
It traces LLM application runtime and runs evaluations; for managed production workflows, Arize offers Arize AX.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: phoenix.arize.com.
Who is Arize Phoenix for?
Developers who want source-available tracing and evals.
Arize Phoenix at a glance
- Open source: Source-available, not OSI open source: Elastic License 2.0 (source-available)
- GitHub: Arize-ai/phoenix · 11,934 stars (as of Oct 21, 2026)
Key features
- Tracing
- Evaluation
- Experiments
- Managed option: Arize AX
Arize Phoenix FAQ
What is Arize Phoenix?
Arize Phoenix is Arize's source-available AI observability platform for experimentation, evaluation and troubleshooting.
Who is Arize Phoenix for?
Developers who want source-available tracing and evals.
Is Arize Phoenix free?
Arize Phoenix's pricing, as the maker states it: Source-available. Check the official site for current plans.
Is Arize Phoenix open source?
No. Arize Phoenix's code is published under Elastic License 2.0 (source-available), which is not an OSI-approved open-source licence.
What are alternatives to Arize Phoenix?
Similar tools include MLflow, Langfuse, LangSmith, Future AGI, OpenLIT and Laminar.
Arize Phoenix ratings and reviews
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Arize Phoenix alternatives
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Future AGI
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OpenLIT
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Laminar
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