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Uptime monitorPrivate · mockup

Sentinel

Watches my live sites and pushes alerts to my phone that name the cause, not just the outage.

WorkersD1Web Push
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What it does

Sentinel watches every site I keep live and tells my phone when one goes wrong. The alert names the cause (DNS, certificate, a server error, or just slow) in its first line, so the fix starts before the laptop opens.

How it is built

  • Scheduled checks from Cloudflare Workers at the edge, with no server to keep alive.
  • D1 keeps each site's history and every incident, with what failed and for how long.
  • Web Push to the phone, with quiet hours so a blip at 3 a.m. waits for morning unless it is still down.

How it works, screen by screen

Screen 1 of 3

Watch list

  • Every live site on one list with its last check, response time and a green or red state.
  • Checks run on a schedule from Cloudflare's edge, no server to keep alive.
Screen 2 of 3

Incident

  • An incident records what failed and why: DNS, certificate, a 5xx from the origin, or a slow response.
  • The phone alert carries the cause in its first line, so the fix starts before the laptop opens.
Screen 3 of 3

Phone alert

  • Web Push to the phone, end to end, with quiet hours so a blip at 3 a.m. waits for morning unless it is still down.

Screens shown are an illustrative mockup. Want the real thing? It is shown in person, not online.

Have a process stuck in spreadsheets?

Tell me how it runs today. I'll show you what it could look like. Want to see one of the private systems for real? Just ask, I'll walk you through it.

[email protected]github.com/arifdev67 ↗otterco.studio ↗