As one of the Opal lovers, I strongly recommend reminder features to help user manage their time. When using selected app, Opal can give users reminders(or maybe a screen time lock) that tell user that [time](like 5 minutes, 10 minutes, etc.) has passed since a user started using the app. Users can set how frequently Opal will give the reminders. This supplements the existing feature, App Lock. App Lock actually just locks the apps when time passed. And just for the short usage, users have to use one chance of using the apps. I think this reminder feature is a combination of App lock and App limit, which will be great. Iām looking foward to getting positive response from Opal Team.