What happened to the URL on file for Openlayer?

URL unreachable The URL on file (https://testbook.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 Openlayer itself is gone: the address on file does not confidently match Openlayer's own domain, so if it turns out to be a marketplace or listing page rather than Openlayer'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:
Openlayer is a powerful testing and observability platform for ML, designed for enterprises. It enables collaboration on finding and debugging issues in models and data, and committing new versions. Openlayer provides unified AI evaluation, observability, and governance across the AI lifecycle, from ML to LLMs. It supports testing, monitoring, and governing AI systems, ensuring a smooth transition from prototype to production through ongoing testing. Openlayer integrates with Git, offers SDKs, and works with various LLM providers, customizable via CLI and REST API.