See a dead-man's-switch actually fire

A monitor for silent failures has a demo problem: when everything works, nothing happens. So here's the opposite — a sped-up run where a job stops pinging on purpose, so you can watch the check trip and the alert land. No signup, nothing to install.

nightly-backup NEW

expects a ping every 3s (stands in for “every day”) · grace 2s

last ping: —

time until due

—

Ping history

📮 Your inbox

No alerts yet — a healthy check stays quiet.

Get a real ping URL — free Then it's your job that pings, and your inbox that hears about silence.

This is a simulation running in your browser — but the state machine is the real one: UP while pings arrive on time, a grace window after one is late, then DOWN with an email (and optional Slack/Discord/webhook) the moment the window lapses, and an UP recovery notice when pings resume. See how it works →