Flutter: Push notifications even if the app is closed

For reminders i would recomend Flutter Local Notifications Plugin. It has a powerful scheduling api. From the documentation of local notification:

Scheduling when notifications should appear – Periodically show a
notification (interval-based) – Schedule a notification to be shown
daily at a specified time – Schedule a notification to be shown weekly
on a specified day and time – Ability to handle when a user has tapped on a notification when the app is the foreground, background or terminated

And for push notification, you can use Firebase Cloud Messaging
or one signal plugin or you can implement natively through platform-channels

Edit: You can also fire notifications according to specific conditions even if the app is terminated. This can be achevied by running dart code in the background. Quoting from the official faq:

Can I run Dart code in the background of an Flutter app? Yes, you can
run Dart code in a background process on both iOS and Android. For
more information, see the Medium article Executing Dart in the
Background with Flutter Plugins and Geofencing.

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