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.
Available Notification Actions
Pause/Resume - Control the timer from the notification
Timer Status - See remaining time at a glance
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
Go to Settings
2
Toggle "Enable Timer 2" off
3
The app will operate as a single timer
6. Settings
Access settings by tapping the gear icon or menu button.
Sound & Vibration
Enable Sound - Play alert sound when timer ends
Enable Vibration - Vibrate device when timer ends
Timer 1 Sound - Choose alert sound for Timer 1
Timer 2 Sound - Choose alert sound for Timer 2
Timer Options
Enable Timer 2 - Toggle second timer on/off
Timer Duration - Set duration from 1 to 60 minutes
Display
Theme - Follow system theme or choose light/dark
Language - English, Japanese, French, or German
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 Training
Timer 1: 30 seconds (high intensity)
Timer 2: 15 seconds (rest)
Use vibration alerts for hands-free notification
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. Subscription
IntervalTimer Duo offers a free trial. After the trial period, a subscription is required to continue using all features. Subscribe to support ongoing development.
Need Help?
If you have any questions or encounter any issues, please contact us: