Send notifications when app is closed

hello everyone friends,
I am developing an application, I want to send notifications to the user when the application is closed for certain periods of time. This is similar to the messages that almost every app sends to our phones every day. As a result of my research, I saw that this is possible with some paid add-ons. Is there a way to do this completely free?

Also check this post by @Mario1, where he demonstrates alarm at certain time with just Itoo:

When you use Itoo, you'll need to have a persistent notification and a background service running all the time versus alarm managers.

using an alarmmanager extension there is no persisent notification necessary...

while closing the app you could set the desired alarm time
to find out when the app is closing you could use the tools extension and its ActivityStateChanged event


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