AI Infrastructure & MLOps Free

Arize Phoenix

Open-source tracing, evaluation, and experimentation for production AI agents

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PricingFree
Starting price$0
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentHybrid
Last verifiedAugust 3, 2026
Overview

Tool overview

Arize Phoenix is listed under AI Infrastructure & MLOps AI tools.

Summary

What is Arize Phoenix?

Arize Phoenix is an open-source platform for tracing, evaluating, annotating, experimenting with, and debugging LLM applications and agents. Teams can run it locally, in Docker or Kubernetes, in their own cloud, fully air-gapped, or through Phoenix Cloud.

Best fit

Best for

AI engineering teams needing open tracing and evaluation infrastructure

Audience

Who is it for?

AI engineersLLM application developersML platform teamsEvaluation and reliability teams
Recommendation

Decision note

Excellent for engineering teams that want an open, self-hostable observability and evaluation stack without tying core traces to a proprietary platform.

Capabilities

Key features

OpenTelemetry tracing for agents and LLM apps

Evaluation, annotation, and experiment workflows

Prompt management and dataset tooling

Free local, Docker, Kubernetes, and cloud deployment

Workflows

Use cases

Trace multi-step agent behavior

Evaluate LLM and RAG quality

Compare prompt and model experiments

Debug production AI failures

Strengths

Pros

  • Fully open source under ELv2
  • No self-hosted feature or usage limits
  • Works with many models and frameworks
Considerations

Cons

  • Self-hosting requires infrastructure ownership
  • ELv2 restricts competing managed-service resale
  • Enterprise support and AX features are separate
Considerations

Limitations

Phoenix improves observability but does not guarantee model correctness or safety. Teams still need representative datasets, domain-specific evaluations, access controls, retention policies, and operational review.

Cost

Pricing details

Pricing modelFree
Starting price$0
Free planYes
Free trialYes
Pricing context

Billing options

Free self-hostingFree Phoenix Cloud instancesOptional commercial support
Pricing context

Pricing note

Phoenix is free and open source with no self-hosting license fees, usage limits, or feature gates. Phoenix Cloud offers free instances. Arize AX is a separate commercial service with Free, $50 monthly Pro, and custom Enterprise tiers.

View official pricing
Compatibility

Supported languages

  • English
Connectivity

Integrations

OpenTelemetry

OpenInference

LangChain

LlamaIndex

DSPy

Specs

Technical details

PlatformsWeb
Multilingual supportYes
Login requiredNo
Open sourceYes
LicenseElastic License 2.0
DeploymentHybrid
CompanyArize AI
Launch year2023
Editions / plansPhoenix OSS Phoenix Cloud Arize AX
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Source code → Data source →
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Answers

Frequently asked questions

Arize Phoenix is an open-source platform for tracing, evaluating, annotating, experimenting with, and debugging LLM applications and agents. Teams can run it locally, in Docker or Kubernetes, in their own cloud, fully air-gapped, or through Phoenix Cloud.
AI engineering teams needing open tracing and evaluation infrastructure
The listed pricing model for Arize Phoenix is free. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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