Wake-up the app to alarm

I developed something similar to an alarm clock app. I need to run the app and then close it or move to other apps. Than, after specific duration or at a specific time, I need my app to wake-up.
How do I do that?

This can not be done. App Inventor apps can not run in the background and wake up.

:worried: No workaround using other apps?

you might be able to do it using Tasker


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

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