Welcome to IntervalTimer Duo for Android, a versatile dual-timer app perfect for interval training, the Pomodoro Technique, and any activity requiring timed intervals.
Background Operation - Timer continues running when app is in background
Notification Controls - Control timer from notification bar
Vibration Alerts - Haptic feedback when timer ends
Custom Notification Sounds - Choose from various alert sounds
Material Design 3 - Modern Android design language
1. Getting Started
Installation
1
Download IntervalTimer Duo from Google Play Store
2
Open IntervalTimer Duo from your app drawer
3
Set your desired timer durations and start timing
2. Main Interface
Circular Timer Display
The main screen features two circular progress indicators:
Timer 1 - Your primary interval (e.g., work time) with circular progress
Timer 2 - Your secondary interval (e.g., rest time) - can be disabled
Basic Controls
Start/Pause - Tap to begin or pause the current timer
Reset - Reset both timers to their initial values
Timer Duration - Tap on the time to adjust duration (1-60 minutes)
3. Background Operation
IntervalTimer Duo continues running reliably in the background, so you can use other apps while timing.
How Background Mode Works
1
Start the timer
2
Press the home button or switch to another app
3
The timer continues running with a persistent notification
Tip: The notification shows the current timer status and allows you to control the timer without opening the app.
4. Notification Controls
Control your timer directly from the notification shade without opening the app.
Notification Behavior
Quick Access - Tap notification to return to the app
5. Timer 2 (Optional)
Timer 2 can be enabled or disabled based on your needs.
Disabling Timer 2
1
On the main screen, uncheck the "Enable Timer 2" checkbox
2
The app will operate as a single timer
6. Settings
Open the Settings screen from the main screen menu. The Settings screen lets you customize the alert sound for each timer.
Settings screen
Timer 1 Sound - Pick an alert sound for Timer 1 via the system Ringtone Picker
Timer 2 Sound - Pick an alert sound for Timer 2 via the system Ringtone Picker
Main screen controls
Enable Timer 2 - Checkbox to toggle the second timer on/off
Sound - Switch to toggle alert sound on/off
Vibration - Switch to toggle vibration on/off
Timer Duration - NumberPicker to set duration from 1 to 60 minutes (minute increments)
7. Battery Optimization
For reliable background timing, you may need to adjust battery optimization settings.
Important: If the timer stops when the app is in the background, disable battery optimization for IntervalTimer Duo in your device settings.
Disabling Battery Optimization
1
Go to device Settings → Apps → IntervalTimer Duo
2
Tap Battery or Battery optimization
3
Select "Don't optimize" or "Unrestricted"
8. Use Cases
Pomodoro Technique
Timer 1: 25 minutes (work)
Timer 2: 5 minutes (break)
Enable sound and vibration for alerts
HIIT-style Training
Timer 1: 1 minute (high intensity)
Timer 2: 1 minute (rest)
Use vibration alerts for hands-free notification
Note: The Android version supports minute-level intervals only (1-60 minutes). For sub-minute intervals (e.g. 30 sec / 15 sec), please use the iOS or macOS version.
Single Timer Mode
Disable Timer 2 in settings
Perfect for cooking, meditation, or simple countdown
Note: When using for exercise, always warm up properly and listen to your body.
9. Pricing
The Android version of IntervalTimer Duo is free with ads, supported by AdMob banner ads. There are no subscriptions and no in-app purchases.
Need Help?
If you have any questions or encounter any issues, please contact us: