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Arize

closed / Overall score: 4.5(leading)

Observability and evaluation platform for AI agents and LLM applications, covering tracing, evaluations, experiments and production issue detection. It includes an embedded AI engineering agent called Alyx and a GenAI trace datastore called adb. It is built by the same team as Phoenix and is offered as SaaS or, on the Enterprise tier, self-hosted.

Arize AX, the commercial platform, is the entity scored here; Phoenix, built by the same team, has its own separate entry.

Openness

1 high confidence

1.0

license: Proprietary
source: closed(proprietary software
self-host: enterprise-only(Kubernetes-based self-hosted AX is offered to Enterprise customers on commercial terms
weights: n/a
note: open source Phoenix is a separate companion product(not the AX platform)

Arize AX is proprietary software under commercial terms with no published source. Enterprise customers can run it self-hosted, but that is a commercial deployment of closed code; only the separate Phoenix project publishes its source.

https://arize.com/docs/ax/selfhosting recorded 2026-09-29
Self-hosted docs page: "Install, operate, and troubleshoot Arize AX in your own environment." and "Built with a Kubernetes-first approach and deployable across all major cloud providers and private cloud environments." so a self-hosted AX exists; no source repository or open license is named on the page.
https://arize.com/pricing/ recorded 2026-09-29
Pricing page lists AX Free, AX Pro and AX Enterprise, with the Enterprise tier offered as "SaaS or Self-Hosted", and says "Phoenix is our open-source, local-first platform for tracing, evaluation, experimentation" as the separate open-source product.
https://arize.com/products/self-hosted/ recorded 2026-09-29
Self-hosted product page: "Deploy Arize AX in your own environment." and "The full capabilities of the AX platform stay intact." Searched the body for open source license or source repository for AX: only the separate Phoenix open-source nav link.
https://arize.com/terms-of-service/ recorded 2026-09-29
Terms of service: Arize grants a "non-exclusive, royalty-free, non-transferable, and non-sublicensable license to use and access the Application" and bars attempts to "derive source code, ideas, algorithms or structure underlying any of the Application or Services", so AX is proprietary.

Adoption

4 medium confidence

4.0

Arize reports roughly 1 trillion spans processed and 1 billion evaluations a year on its homepage. It publishes no user or customer count, so that throughput is the only evidence of use.

https://arize.com/ recorded 2026-09-29
Homepage stat cards read "1 Trillion" spans processed and "1 Billion" evals per year, and the AX copy calls adb "the industry’s fastest and most scaled observability datastore". Searched the body for a user, customer or account count for AX: none.

Capability

5 medium confidence

5.0

Arize AX is a commercial observability platform covering tracing, evaluation, prompt and agent experiments, production issue detection and an embedded AI engineering agent (Alyx), with a datastore for GenAI traces (adb). Its feature set goes beyond Langfuse's.

https://arize.com/ recorded 2026-09-29
Homepage: "Like Cursor or Claude Code, but for AI engineering." and Alyx "runs evals, debugs issues, and improves your agents." plus "ADB: The datastore for GenAI traces".
https://arize.com/docs/ax recorded 2026-09-29
AX docs home: "Evaluate agent performance with LLM-as-a-Judge, agent-as-a-judge, or code evaluators." and "Automatically surface issues from production traces with Signal." and "Alyx: Your AI engineering agent for every step".

Verified 2026-09-29