Doorman reports signal rate for each app on your phone: the share of its notifications you actually open. Android reports whether a notification was opened or swiped away, so the number comes from your own behaviour rather than a guess.

On the test phone one news app posted 209 notifications in a week and none of them were opened.

The paid tier holds the apps you switch on and delivers them together on your interval. Verification codes, calls, alarms and messages are never held.

It is on Play now and launching here on Sep 24. If you have an Android phone and a worst offender in mind, I want to know whether the number matches what you expected.