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Ping is a simple non-intrusive service built for indie developers and early stage startups where using a super bulky uptime notification system isn't viable or, worth the effort.
The project is run by reaper (not as scary as he sounds) as a micro app. It's free to use but it'd greatly help if you could support the project. $1 is all you need
You will receive an email as per your monitor configuration in the Advanced section.
By default you'll be notified on a downtime of 2 minutes.