Phoenix
Open-source AI observability platform for evaluating LLM apps
- Pricing
- Paid
- Platform
- Web
- Open source
- Yes
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.
Specifications
Everything we hold on this listing.
- Category
- Coding & Dev Tools
- Pricing
- Paid
- Platforms
- Web
- Website
- phoenix.arize.com
- 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.
| Tool | Pricing | API | Open source |
|---|---|---|---|
| Phoenix | Paid | Not stated | Yes |
| Agenta | Paid | Not stated | Yes |
| Helicone AI | Paid | Not stated | Yes |
| Langfuse | Paid | Not stated | Yes |
| Opik | Paid | Not stated | Yes |
Frequently asked
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, Helicone AI, Langfuse, Opik, all coding & dev tools tools that overlap with Phoenix on coding, developer, llm. See the full list at brofindai.com/alternatives/phoenix.
