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Pricing sourced from Arize Phoenix · Last verified March 2026
Yes, Phoenix is completely free and open-source. All core features including embedding visualization, evaluation frameworks, and tracing are included at no cost. Arize offers an optional cloud platform for teams that need managed hosting and collaboration features.
Phoenix specializes in deep analytical investigation and RAG system optimization. LangSmith focuses on prompt management and team workflows. W&B provides broader ML experiment tracking. Choose Phoenix for embedding analysis and retrieval quality insights, LangSmith for prompt iteration and team collaboration.
Phoenix is designed for data scientists and ML engineers with Python/notebook experience. It launches from Jupyter notebooks and assumes familiarity with ML workflows. Non-technical users should consider more user-friendly alternatives.
Phoenix provides embedding visualization, distribution drift detection, and research-grade evaluation methodologies. Basic logging tools just capture request/response data. Phoenix helps you understand why your LLM application behaves a certain way, not just what happened.
Yes, the open-source version runs entirely on your infrastructure with no external data sharing. The Arize cloud platform provides enterprise security features, compliance certifications, and managed hosting for organizations that prefer a managed solution.
AI builders and operators use Arize Phoenix to streamline their workflow.
Try Arize Phoenix Now →LangSmith lets you trace, analyze, and evaluate LLM applications and agents with deep observability into every model call, chain step, and tool invocation.
Compare Pricing →Experiment tracking and model evaluation used in agent development.
Compare Pricing →DeepEval: Open-source LLM evaluation framework with 50+ research-backed metrics including hallucination detection, tool use correctness, and conversational quality. Pytest-style testing for AI agents with CI/CD integration.
Compare Pricing →Leading open-source LLM observability platform for production AI applications. Comprehensive tracing, prompt management, evaluation frameworks, and cost optimization with enterprise security (SOC2, ISO27001, HIPAA). Self-hostable with full feature parity.
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