{"data":{"slug":"arize-phoenix","name":"Arize Phoenix","tagline":"ELv2 self-host AI observability & eval — traces, datasets, playground","category":"agents","categoryName":"AI Agents","url":"https://phoenix.arize.com","github":"https://github.com/Arize-ai/phoenix","pricing":"source-available","hook":"Phoenix is Arize’s self-host AI observability and evaluation stack — traces, embeddings, datasets, and evals when Langfuse is the MIT default and you want Phoenix’s notebook-friendly path.","whatsGood":"Elastic License 2.0 (Arize-ai/phoenix). Open inference tracing, embeddings viz, datasets, experiments, and eval helpers; pip/Docker self-host; pairs with Arize AX cloud if you outgrow local. Docs at arize.com/docs/phoenix. ★11,645 on GitHub 2026-09-29.","theCatch":"NOT OSI open source — ELv2 forbids offering Phoenix as a competing hosted SaaS. Vs Langfuse (MIT full-stack self-host) and Braintrust (eval-first freemium): Phoenix is Arize’s ELv2 observability/eval kit with strong notebook/embedding UX, not MIT and not Braintrust’s CI-eval product. Arize cloud is the upsell when you want managed multi-tenant.","verdict":"ELv2 self-host AI obs/eval when Phoenix’s tracing+evals fit and you accept source-available — not Langfuse MIT, not Braintrust CI-eval.","addedAt":"2026-09-29","featured":false,"domain":"AI Agents","subSpecialty":"Agents","subcategory":"Evals & Tracing","tags":["self-host","source-available","license-unclear","rag","evals","observability","active"],"capabilities":[],"surfaces":["Self-host"],"ecosystem":["Multi-platform"],"licenseModel":"Open-Core","githubStars":11905,"starsPerWeek":58,"access":"free","archived":false,"repo":{"createdAt":"2022-11-09","pushedAt":"2026-10-18","license":"NOASSERTION","archived":false,"checkedAt":"2026-10-19"}},"related":[{"slug":"claude-code","name":"Claude Code","tagline":"Terminal-first coding agent with deep repository context"},{"slug":"cursor","name":"Cursor","tagline":"The AI-first code editor that understands your codebase"},{"slug":"devin","name":"Devin","tagline":"Autonomous AI engineer for defined engineering tasks"},{"slug":"stagehand","name":"Stagehand","tagline":"AI-native browser automation that mixes code and natural language"},{"slug":"browser-use","name":"Browser Use","tagline":"Open-source framework for LLM-driven browser agents"}],"links":{"self":"/api/gems/arize-phoenix","html":"/gems/arize-phoenix","markdown":"/gems/arize-phoenix.md","category":"/api/gems?category=agents","categoryPage":"/stacks/agents"}}