What we checked on Arize
Agent permissions
Self-hosted Phoenix has admin, member, and viewer roles with explicitly different mutation permissions.
Users have one of three roles: admin, member, or viewer. Viewers have read-only access and cannot perform mutations.
Model choice
Phoenix is documented as model-, framework-, and language-agnostic, rather than tied to Arize inference.
Phoenix works with any model, framework, or language. No lock-in.
arize.com/phoenixChecked
Self-hosted
Phoenix can run locally, in containers, or on customer infrastructure; AX Enterprise also offers self-hosting.
Run Phoenix locally, in a container, or on your own infrastructure
Open source
Phoenix is the vendor's ELv2-licensed OSS core, while AX is presented separately as a managed platform.
ELv2 licensed. 10k+ GitHub stars. Built in the open with contributions from teams building production agents.
arize.com/phoenixChecked
SDK languages
Phoenix's documented local runtime is a Python package; no other SDK language is established here.
Phoenix is a Python package
Tracing and evals
AX records run inputs, outputs, tools, and costs, then supports evaluation and controlled experiments.
Arize records each run: inputs, outputs, tools, and costs.
arize.com/docs/axChecked
How it meters
The entry paid AX Pro plan is a flat monthly platform fee with included span and issue limits.
$50 per month
arize.com/pricingChecked
Free tier
AX Free is a standing no-credit-card plan, so an individual can begin without a sales call.
No credit card required
arize.com/pricingChecked
MCP server
Phoenix includes a beta remote MCP server that lets compatible clients query and act on live data.
The Remote MCP Server (beta) is built into Phoenix at /mcp
A company can buy it
The pricing page explicitly offers a plan for AI-native teams and an Enterprise plan for scaled team use.
On the page: AX Pro plan card, audience label
arize.com/pricingChecked
Seat model
Arize does not price AX by seat: every published tier lists an unlimited number of users.
Users Unlimited
arize.com/pricingChecked
Audit log
Audit logs are listed for AX Enterprise only, and are not included on Free or Pro tiers.
On the page: Security comparison table, Audit logs row
Single sign-on
Enterprise SSO is available only with AX Enterprise; the published Free and Pro columns do not include it.
On the page: Security comparison table, Enterprise SSO row
Opt out of training
Arize says inputs to its AI-powered features are not used to train models without separate consent.
We do not use your inputs to AI-powered features to train our models unless you separately consent to such use.
arize.com/privacy-policyChecked
Data residency
AX plans list US, EU, and Canadian data regions, with a vendor announcement of EU residency for all users.
On the page: Security comparison table, Data region row
Getting out
Phoenix provides a client method to retrieve spans and associated annotations into dataframes for downstream use.
The Phoenix client provides useful ways to pull down spans and their associated annotations.
Certifications
Arize's Trust Center declares SOC 2, ISO 27001, GDPR, HIPAA, and PCI DSS compliance or certification.
On the page: Trust Center, certifications badges
arize.com/trust-centerChecked
Arize price and terms
Terms
- Free plan
- YesYesAX Free includes 10 issues, 25k spans, and 1 GB per month
The terms in full
no credit card required.
What needs a higher plan
- AX Enterprise
- Audit log, Single sign-on
For AI agents
- MCP server
- Yes
Pricing page, captured
arize.com/pricing, checked
Arize alternatives
1 alternative- This spot is openBe the first agent people see on Arize's page.
- First on your rivals' pages
- Top of your category
- First in the home page list
- First in search results
- In comparisons and guides
- In the weekly newsletter
- Visits and AI reads each month
Arize and Langfuse
Arize beside its alternatives: the price on each one's site, all checked 29 Oct Tool Price Arize Free, then $50 a month Langfuse Free, then $29 a month All checked
Compare the two
Questions about Arize
- How much does Arize cost?
- Arize is free to use. From arize.com/pricing, checked 29 October 2026.
- Does Arize have an API or an MCP server?
- It has an MCP server.
- Is Arize open source, and can you host it yourself?
- Part of it is open source. You can host it yourself.
- What have we checked on Arize?
- 17 facts, under these headings: How much it does unattended, which models it runs on, whose machine it runs on, building with it, what it costs to run, buying it for a team, what happens to your code.
- How do we check Arize?
- We hold 17 facts on Arize, quoted from 10 pages. Facts and price last checked 29 October 2026.
Sources and changes
Last changed
Sources on arize.com10
Is this yours?
AI assistants like ChatGPT and Claude opened The Agents Index pages 2,746 times in September. Claiming is free. You get this page's reader numbers and the verified owner mark. You confirm it with an email at arize.com.
Report an error if a fact is wrong.