Healthchecks.io is a monitoring service for your cron jobs, background services and scheduled tasks. It works by listening for HTTP "pings" from your services. When it doesn't hear from a service for a configurable period of time, it sends you an alert.
Healthchecks.io monitors your cron jobs, background services and scheduled tasks. It notifies you when your nightly backup has not completed, your Raspberry Pi has lost connection, or a checkout flow on your shopping site has not completed for too long.