Maybe you know this situation: Your phones lays on your desk, you're in the kitchen and you get called. You do not hear your ring and when you come back to your desk, you don't notice that you were called because your device has no notification LED (and you're not using NoLED)...

Therefore I made another small app, called "Vibration Notifier" which does the following:
When you have a missed call or an unread SMS, the app keeps vibrating every X minutes for Y times or until you turn on the display of your device.

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To be noticed about events from other apps, you need to add the app in the accessibility settings. I can understand that some people are scared by the "the app can read all your personal information" warning, but the app doesn't have the internet-permission - so even if it would collect your personal information (which it doesnt) it wouldnt be able to send them to anyone.

Screenshots: