With Post i dag? you can check when your post code* is receiving post in the mailbox for the next 2 weeks.
If you allow notifications they will be added and remind you on the days of the next 2 weeks you receive post. In Settings you can set the time you would like to receive notifications.
The app comes with a Widget extension which updates at midnight every day allowing effortless checking if the mail is arriving or not. The widget uses the post number set in the app.
*This is only for Norwegian post codes.