Never miss a reminder again.

ReminderBox is an offline reminder app that screams for your attention — blinking screen, looping alarm, persistent notification — until you tap Stop. Built for Android, works on any Android.

An alarm that demands to be heard.

Full-screen blinking alert

When a reminder fires, the entire screen turns red and blinks rapidly. It's impossible to miss, even from across the room. Works over the lock screen so you see it the moment you pick up your phone.

Looping alarm sound + vibration

The alarm plays on repeat and vibration pulses continuously — both stop only when you tap the Stop button. Auto-silences after 5 minutes as a safety net so it doesn't ring all day.

Persistent, un-dismissible notification

The notification cannot be swiped away. It stays in your notification shade with a 🛑 STOP button built right in — tap it without even opening the app.

Works in background on any Android phone

Uses a ForegroundService + WakeLock + battery optimization bypass to survive ColorOS's aggressive app-killing. Includes a built-in Setup Guide to configure your specific phone model correctly.

Recurring reminders: weekly, monthly, yearly

Set a reminder once and it automatically reschedules itself. Perfect for monthly bills, annual checkups, weekly meetings. Recurrence survives phone reboots.

100% offline — no account, no internet

All data stored locally using SQLite. No sign-up, no cloud sync, no ads, no tracking. Install it and it works immediately, forever.

Set it in 30 seconds.

01

Tap Add Reminder

Type your reminder title, pick a date and time, choose recurrence.

02

Tap Save

The alarm is scheduled. Close the app, lock your screen — it still fires.

03

Alarm fires

Screen wakes, full red alert blinks, alarm loops. Notification persists.

04

Tap Stop

In the alert screen or directly from the notification. Silence in one tap.

Stop missing what matters.

Download ReminderBox now, no ads, no account, works offline. Built for people who can't afford to forget.