Arize Phoenix

Open-source AI observability for tracing and evals

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About Arize Phoenix

Arize Phoenix is an open-source observability tool from Arize for tracing LLM apps and evaluating outputs in notebooks or the UI. Day to day, it visualizes retrieval, flags hallucination-prone spans and compares experiments across prompts and models. For teams moving agents from prototype to production, that focus on reliability and visibility matters more than adding another layer of fragile automation.

Arize Phoenix key facts

Category: AI Agents
Pricing: Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas: observability, open source, tracing
Official site: phoenix.arize.com

About the AI Agents category

Autonomous AI agents that plan and execute tasks for you — general agents, AI browsers, AI employees, app builders, and coding agents. The AI Agents category on Tools Hub currently lists 156 tools. Alongside Arize Phoenix, it includes Promptfoo, Vellum, Agenta, Weights & Biases.

FreeAI Agentsobservabilityopen-sourcetracing

More in AI Agents

Comparing tools in the AI Agents category? These related listings are worth a look: Promptfoo — CLI for testing and red-teaming LLM applications; Vellum — Platform for building and evaluating AI workflows; Agenta — Open-source LLMOps platform for prompt experiments.