Who it is for
Anyone triaging a page that will not load, from a student before class to a support agent taking a first look.
Plain-language reachability checks for public websites
Overview
This app tests whether a public website responds and reports the result in ordinary words. A full address works, and so does the name of the site.
Rather than returning a single verdict, it separates causes that look identical from the outside: a site can be offline for everyone, blocked for one person, slow because it is busy, or unreachable because of a local connection, a VPN or a firewall. When the site does answer, the app helps work through what else might explain a page that will not load.
Honesty about limits is stated explicitly. If a check cannot be completed for technical reasons, or the evidence does not support a conclusion, it says so instead of guessing. No technical background is expected of the person asking, and answers stay short unless more detail is requested.
Anyone triaging a page that will not load, from a student before class to a support agent taking a first look.
It distinguishes a site being down from the local causes that mimic it, and declines to speculate when a check is inconclusive.
Availability
Is It Down? Availability Check is listed in the ChatGPT apps directory only. Spheric Admin Ltd has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
Same company
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Brain training drills run inside ChatGPT
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Recipe lookup rendered as a widget in chat
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Builds and reorders lists inside a ChatGPT conversation
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This is an independent catalogue entry compiled by Node8 from Is It Down? Availability Check's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with Spheric Admin Ltd, and inclusion here is not an endorsement.
Node8 builds MCP servers end to end: deciding which tools are worth exposing, the authentication and permission model, the review submissions, and the onboarding that gets them used. One server serves ChatGPT, Claude, and Microsoft Copilot.