Know before your users do
Free email alerts for any of the 305 services we track — sent when we confirm a real outage, and again when it recovers.
Real outages only
Alerts fire when our scoring engine confirms an incident from the combined evidence — official feed, independent probes, user reports. A 401/403/429 anti-bot response is flagged as probe-blocked, never as down.
Recovery included
One email when the incident opens, one when it resolves — at most one alert per service per 4 hours, and no marketing, ever.
Slack and webhooks included
Route any alert to a Slack incoming webhook or your own HTTPS endpoint from the manage link in every email — and one signup from a stack dashboard covers your whole stack with a single confirmation.
One click out
Double opt-in on the way in, one-click unsubscribe link in every email on the way out.
Need faster probes or incident history you can cite? See the Pro plan →