Arize Phoenix
Open-source LLM tracing, evaluation, and experimentation platform built on OpenTelemetry, by Arize AI.
Last verified:
Arize Phoenix is an open-source observability and evaluation library for LLM applications and agents, built natively on OpenTelemetry and the OpenInference semantic conventions. It can be self-hosted for free (pip install, Docker, or Kubernetes) or run on a free-tier hosted Phoenix Cloud, while Arize AI's commercial Arize AX platform serves enterprises needing SOC 2/HIPAA-compliant SaaS or self-hosted deployments with SSO and audit logs. Arize AI was founded in 2020 in Berkeley, CA, and has raised a $70M Series C (Feb 2025).
Pricing
| Tier | Price | Key features |
|---|---|---|
| Phoenix (Self-Hosted OSS) | $0 | Full core tracing/eval/experiment features, Elastic License 2.0 (source-available, free), Deployable via pip, Docker, or Kubernetes/Helm |
| Phoenix Cloud (Free) | $0/monthly | Hosted, self-serve signup, 2 free spaces, 10GiB storage |
| Arize AX Free | $0/monthly | 1GB storage, 15-day retention, Unlimited users/evals |
| Arize AX Pro | $50/monthly | 10GB storage, 30-day retention, Unlimited users/evals |
| Arize AX Enterprise | Custom | Custom spans/storage/retention, SaaS or self-hosted (incl. air-gapped), SSO, RBAC, audit logs, SOC2/HIPAA/GDPR compliance bundle |
Source: https://arize.com/pricing/
Agent-readiness
- Discoverability
- 85/100
- Machine-readable content
- 90/100
- Programmatic access
- 95/100
- MCP / agent support
- 85/100
- Self-serve transactability
- 85/100
- Transparency
- 75/100
Security & compliance
- SSO / SAML
- Yes
- Encryption at rest
- Yes
- Encryption in transit
- Yes
- Audit log
- Yes
- Pentest report
- Not publicly documented
"Not publicly documented" means Crail found no public evidence either way — not a confirmed absence. See our methodology. Trust center: https://arize.com/trust-center/.
FAQ
Does Arize Phoenix have a free tier?
Yes, Arize Phoenix offers a free tier or free trial.
Can you buy Arize Phoenix without talking to sales?
Yes, Arize Phoenix can be purchased self-serve without a sales call.
Does Arize Phoenix have an official MCP (Model Context Protocol) server?
Yes, Arize Phoenix publishes an official MCP server (https://github.com/Arize-ai/phoenix/tree/main/js/packages/phoenix-mcp).
What compliance certifications does Arize Phoenix hold?
Arize Phoenix holds: SOC 2 Type II, ISO/IEC 27001, PCI DSS, HIPAA, GDPR.
What people are saying on Reddit & Hacker News
Real, publicly-posted discussion — not a Crail-verified review. Always linked back to the original post so you can read it in context.
“Big fan of Arize OpenInference and Phoenix”
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“Been using it for a while, def recommend anyone building with LLMs to try it out”
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Reviews
No reviews yet for Arize Phoenix. Be the first to submit a verified review.
Methodology & disclosure
Data verified via agent crawled, last checked 2026-07-26. Agent-readiness methodology version crail-ar-v0.1. No vendor payment influences these scores — see our methodology page.