What happened to the URL on file for Arize AI?

URL unreachable The URL on file (https://horizonalpha.ai) did not respond across three consecutive checks; the streak completed on 2026-09-01.

This reports what that URL did, not a claim that Arize AI itself is gone: the address on file does not confidently match Arize AI's own domain, so if it turns out to be a marketplace or listing page rather than Arize AI's own site, this observation is still accurate about the URL, just not about the product. See the methodology for how the match is made.

The vendor's own description, unedited:
Arize AI offers a unified LLM Observability and Agent Evaluation Platform for AI applications, from development to production. It provides tools for Generative AI, ML & Computer Vision, and Open Source LLM Tracing & Evals. Arize AX helps accelerate AI app and agent development and perfect them in production. It integrates development and production to enable a data-driven iteration cycle, using real production data to power better development and aligning production observability with trusted evaluations.

Live alternatives

Upstage AI verified listing → EmilyGPT verified listing → YoBulk verified listing → Symbl.ai verified listing → Neon AI verified listing → LLMOps.Space verified listing → LLM Pricing verified listing → DeepSeek verified listing →

How this was decided

Not an editorial call. The URL on file failed three consecutive checks, with a confirmation re-probe before the streak counted (a bot-wall response never counts as one), and the 3-miss rule marks the listing discontinued automatically. If the URL responds again, the registry restores it on its own: warn first, then active. Both directions are recorded as events.

Spot an error? Tell us. Corrections to the record append, they never rewrite.