Download websites that use Upptime

Uptime checks run somewhere else. A monitor polling your services lives on a schedule inside somebody's infrastructure, and none of that polling is visible to a crawler looking at a website. What a crawler can see is the page the monitor publishes, so a detection count for Upptime counts status pages rather than monitored systems.

The distinction changes what the row is worth. An organisation appears here because it decided to tell the public when it is broken, and publishing a status page is a commitment that tends to follow from having customers who notice outages and ask about them. Maintaining such a page is also a habit rather than a purchase, since the work is never urgent and always visible, which makes the population an unusually honest sample of teams that take operational transparency seriously.

The project is distributed under the MIT license and written in JavaScript, and our record dates it to 2020. Free tooling of that shape spreads by copying rather than by selling, so no vendor customer list exists anywhere and crawl detection is the practical way to see where copies landed. Adoption of a permissively licensed project is invisible to everyone including its own maintainers, which is precisely the gap a detection dataset fills.

As of October 2026 we detect the fingerprint on 15 sites. The count is small and probably conservative. Status pages usually sit on a subdomain such as status or health, and depending on how a crawl is seeded those hosts get discovered late or missed entirely. A generated page also carries only the markers its template left behind, so a maintainer who restyled the output or stripped a footer removes the fingerprint without intending to hide anything.

Two audiences want the list rather than a lookup. Vendors selling hosted monitoring and status page services want the teams already running free tooling, because those teams have accepted the need and declined only the price, which is a considerably shorter sales conversation than starting from nothing. Researchers studying operational transparency want the population itself, since the interesting question is not whether a named company publishes uptime data but which industries, which company sizes and which hosting choices correlate with publishing it. No per-domain lookup answers either question, because the exercise depends on finding sites you have never heard of, and the tail here consists almost entirely of names nobody would think to type into a search box.