# Arize — Managed agent observability and evals with an ELv2-licensed self-hosted Phoenix option. > Source: The Agents Index — https://theagentsindex.com/arize (structured, researched, re-verified) mixed: Arize pairs its managed AX platform with Phoenix, an ELv2-licensed self-hostable observability and evaluation product. It traces production agents, evaluates their behavior, and compares changes through experiments. **Best for:** AI-native teams improving agents with production traces and evaluations | Fact | Value | | --- | --- | | Website | https://arize.com/ | | Category | LLM observability & tracing | | Open source | Partly | | Price | Free | | Price source | https://arize.com/pricing/ | | Price checked | 29 October 2026 | | MCP server | Yes | | API | Not stated | | Self-host | Yes | | Facts | 17 facts from 10 sources | | Facts checked | 29 October 2026 | Screenshot of Arize: https://theagentsindex.com/img/1920/screenshots/arize.webp, captured 1 November 2026 **What we checked** - Pages last read: 29 October 2026 - Facts checked: 17 facts (From 10 sources) - AI answers: Named in 0 of 151 (Our October check) ## What we checked on Arize ### How much it does unattended **Agent permissions** · Yes — 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. > — https://arize.com/docs/phoenix/self-hosting/features/authentication · Authentication docs, User Management section, checked 29 October 2026 ### Which models it runs on **Model choice** · Yes — 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. > — https://arize.com/phoenix/ · Own your AI Stack, Vendor Agnostic section, checked 29 October 2026 ### Whose machine it runs on **Self-hosted** · Yes — 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 > — https://arize.com/docs/phoenix/get-started · Start Phoenix introduction, checked 29 October 2026 **Open source** · Partly — 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. > — https://arize.com/phoenix/ · Own your AI Stack, OSS Community section, checked 29 October 2026 ### Building with it **SDK languages** · Yes — Phoenix's documented local runtime is a Python package; no other SDK language is established here. > Phoenix is a Python package > — https://arize.com/docs/phoenix/get-started · Run Phoenix, Local section, checked 29 October 2026 **Tracing and evals** · Yes — AX records run inputs, outputs, tools, and costs, then supports evaluation and controlled experiments. > Arize records each run: inputs, outputs, tools, and costs. > — https://arize.com/docs/ax/ · The Arize AX workflow, Instrument section, checked 29 October 2026 ### What it costs to run **How it meters** · Yes — The entry paid AX Pro plan is a flat monthly platform fee with included span and issue limits. > $50 per month > — https://arize.com/pricing/ · AX Pro plan card, price, checked 29 October 2026 **Free tier** · Yes — AX Free is a standing no-credit-card plan, so an individual can begin without a sales call. > No credit card required > — https://arize.com/pricing/ · AX Free plan card, checked 29 October 2026 **MCP server** · Yes — 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` > — https://arize.com/docs/phoenix/integrations/mcp · MCP Server docs, introductory paragraph, checked 29 October 2026 ### Buying it for a team **A company can buy it** · Yes — The pricing page explicitly offers a plan for AI-native teams and an Enterprise plan for scaled team use. > For AI-native teams > — https://arize.com/pricing/ · AX Pro plan card, audience label, checked 29 October 2026 **Seat model** · No — Arize does not price AX by seat: every published tier lists an unlimited number of users. > Users Unlimited > — https://arize.com/pricing/ · Plan cards, Users allowance, checked 29 October 2026 **Audit log** · Partly — Audit logs are listed for AX Enterprise only, and are not included on Free or Pro tiers. > Audit logs | — | — | ✓ > — https://arize.com/docs/ax/security-and-settings/pricing-and-usage · Security comparison table, Audit logs row, checked 29 October 2026 **Single sign-on** · Partly — Enterprise SSO is available only with AX Enterprise; the published Free and Pro columns do not include it. > Enterprise SSO | — | — | ✓ > — https://arize.com/docs/ax/security-and-settings/pricing-and-usage · Security comparison table, Enterprise SSO row, checked 29 October 2026 ### What happens to your code **Opt out of training** · Yes — 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. > — https://arize.com/privacy-policy/ · Privacy Policy, Artificial Intelligence section, checked 29 October 2026 **Data residency** · Yes — AX plans list US, EU, and Canadian data regions, with a vendor announcement of EU residency for all users. > Data region | US or EU or CA | US or EU or CA | US or EU or CA > — https://arize.com/docs/ax/security-and-settings/pricing-and-usage · Security comparison table, Data region row, checked 29 October 2026 **Getting out** · Yes — 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. > — https://arize.com/docs/phoenix/tracing/how-to-tracing/importing-and-exporting-traces/exporting-annotated-spans · Exporting Annotated Spans introduction, checked 29 October 2026 **Certifications** · Yes — Arize's Trust Center declares SOC 2, ISO 27001, GDPR, HIPAA, and PCI DSS compliance or certification. > SOC ll Compliant PCI DSS Compliant ISO/IEC 27001 Certified GDPR Compliant HIPAA Compliant > — https://arize.com/trust-center/ · Trust Center, certifications badges, checked 29 October 2026 ## Arize price and terms **Terms** - Free plan: Yes — AX Free includes 10 issues, 25k spans, and 1 GB per month — no credit card required. **What needs a higher plan** - AX Enterprise: Audit log, Single sign-on ## For AI agents - MCP server: Yes Pricing page as we captured it: https://theagentsindex.com/img/1920/screenshots/arize/pricing.webp, captured 1 November 2026 Read on https://arize.com/pricing/, 29 October 2026. ## Arize alternatives - [Langfuse](https://theagentsindex.com/langfuse) · Free plan, then $29 a month: Open-source, self-hostable tracing and evaluation platform for LLM applications. It publishes a price. [1 alternative](https://theagentsindex.com/arize/alternatives/) ## 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. How we check every listing: https://theagentsindex.com/methodology/ ## Sources and changes Last changed 1 November 2026 **Sources on arize.com** (10) - https://arize.com/pricing/, read 29 October 2026 - https://arize.com/docs/ax/security-and-settings/pricing-and-usage, read 29 October 2026 - https://arize.com/docs/phoenix/get-started, read 29 October 2026 - https://arize.com/phoenix/, read 29 October 2026 - https://arize.com/docs/ax/, read 29 October 2026 - https://arize.com/docs/phoenix/integrations/mcp, read 29 October 2026 - https://arize.com/docs/phoenix/self-hosting/features/authentication, read 29 October 2026 - https://arize.com/docs/phoenix/tracing/how-to-tracing/importing-and-exporting-traces/exporting-annotated-spans, read 29 October 2026 - https://arize.com/privacy-policy/, read 29 October 2026 - https://arize.com/trust-center/, read 29 October 2026 ## Is this yours? AI assistants like ChatGPT and Claude opened The Agents Index pages 2,746 times in September. Claim Arize: https://theagentsindex.com/claim/arize Report an error if a fact is wrong: hello@theagentsindex.com, subject "Report an error: Arize (arize)".