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Phoenix

Open-source AI observability platform for evaluating LLM apps

About Phoenix

Phoenix by Arize is an open-source observability and evaluation tool for AI and LLM applications. It provides tracing, dataset management, and built-in evaluators to measure hallucination, relevance, and toxicity. Designed for ML engineers and data scientists who need deep insight into model and agent behavior during development and production.

Details

Pricing
Paid
Platforms
Web
Open source
Yes
Added
Apr 23, 2026
Source
awesome

opensource, platform, tags were inferred from this tool's own description, not confirmed by its maker. Claim this listing to correct it.

How Phoenix compares

The closest tools in the directory, matched on shared capability rather than category alone.

ToolPricingAPIOpen source
Phoenix (this tool)PaidNot statedYes
AgentaPaidNot statedYes
aiderPaidNot statedYes
BloomPaidNot statedYes
ContinuePaidNot statedYes

Phoenix FAQ

What is Phoenix used for?

Phoenix by Arize is an open-source observability and evaluation tool for AI and LLM applications. It provides tracing, dataset management, and built-in evaluators to measure hallucination, relevance, and toxicity. Designed for ML engineers and data scientists who need deep insight into model and agent behavior during development and production.

Is Phoenix free?

Phoenix is Paid. Paid tool. Visit the site to view current pricing plans.

What platforms does Phoenix run on?

Phoenix runs on Web. Whether it offers a public API isn't stated — check the vendor's docs before planning an integration.

Is Phoenix open source?

Yes — Phoenix publishes its source, so you can self-host it, audit what it does with your data, and avoid per-seat pricing. Browse more open-source options at brofindai.com/tags/open-source.

What are the best alternatives to Phoenix?

The closest alternatives are Agenta, aider, Bloom, Continue — all coding & dev tools tools that overlap with Phoenix on coding, developer, llm. See the full list at brofindai.com/alternatives/phoenix.

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Phoenix

phoenix.arize.com

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Pricing Model

Paid

Paid tool. Visit the site to view current pricing plans.

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