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IntervalTimer Duo User Manual (iOS)
Welcome to IntervalTimer Duo for iOS, a versatile dual-timer app perfect for interval training, the Pomodoro Technique, and any activity requiring timed intervals.
Key Features
Dual Timers - Alternate between two customizable timersPreset Management - Save and quickly load your favorite timer configurationsLive Activity - View timer on Dynamic Island and Lock ScreenSound & Vibration Alerts - Customizable notifications with 6 sound optionsiPad Optimized - Beautiful layout for both iPhone and iPadDark Mode - Seamless integration with iOS system appearance
1. Getting Started
Installation
1
Download IntervalTimer Duo from the App Store
2
Open IntervalTimer Duo from your Home Screen
3
Start using with default presets (HIIT, Pomodoro) or customize your own timers
2. Main Interface
Timer Display
The main screen features two circular timer displays:
Timer 1 - Your primary interval (always active)Timer 2 - Your secondary interval (optional, can be disabled)
Setting Timer Duration
1
Tap on a timer card to open the time picker
2
Use the wheel pickers to set minutes and seconds (0-59 each)
3
Tap "Done" to save your settings
Tip: For Timer 2, you can toggle it ON or OFF directly in the time picker sheet.
Basic Controls
START - Begin the timer sequencePAUSE - Pause the running timerRESUME - Continue from where you pausedRESET - Reset both timers to their initial values
3. Preset Management
Presets allow you to save and quickly load your favorite timer configurations.
Default Presets
The app comes with two built-in presets:
Preset Name
Timer 1
Timer 2
HIIT
30 seconds
10 seconds
Pomodoro
25 minutes
5 minutes
Loading a Preset
1
Find the "Presets" section below the timer displays
2
Tap on a preset card to load its timer settings
Creating a New Preset
1
Tap the "+" button in the Presets section
2
Enter a name for your preset
3
Set Timer 1 duration using the wheel picker
4
Toggle Timer 2 ON/OFF and set its duration if needed
5
Tap "Save" to save your preset
Editing a Preset
1
Long press on a preset card
2
Modify the name or timer settings as needed
3
Tap "Save" to update, or "Delete Preset" to remove it
Tip: Long press triggers a haptic feedback to confirm you've entered edit mode.
4. Settings
Access settings by tapping the gear icon in the top right corner.
General Settings
Enable Sound Alerts - Play sound when timer endsVibration - Enable/disable vibration alerts (iPhone only)
Sound Settings
Choose from 6 different alert sounds for each timer:
Decision
Warning
Bell
Trill
Marimba
Pop
Use the preview button (speaker icon) to hear each sound before selecting.
Alert Volume
Adjust the volume slider to set your preferred alert volume level.
Appearance
Theme - Choose System (follows iOS), Light, or Dark mode
5. Live Activity (Dynamic Island & Lock Screen)
On supported devices, IntervalTimer Duo displays the current timer status on your Dynamic Island and Lock Screen.
How It Works
Start the timer to automatically activate the Live Activity
View remaining time without opening the app
The Live Activity shows which timer is currently running
Activity ends when you reset or complete the timer
Tip: Live Activities require iOS 16.1 or later and a compatible device.
6. Use Cases
Pomodoro Technique
Use the built-in "Pomodoro" preset
Timer 1: 25 minutes (focused work)
Timer 2: 5 minutes (short break)
Enable sound and vibration for alerts
HIIT Training
Use the built-in "HIIT" preset
Timer 1: 30 seconds (high intensity)
Timer 2: 10 seconds (rest)
Enable vibration for hands-free notification during workouts
Cooking
Create a custom preset for your recipe
Disable Timer 2 if you only need a single timer
Use different sounds to distinguish multiple cooking tasks
Study Sessions
Create a custom preset (e.g., 45 min study / 10 min break)
Use the Live Activity to track time without unlocking your phone
Note: When using for exercise, always warm up properly and listen to your body.
7. Purchase & Trial
IntervalTimer Duo offers a 7-day free trial . After the trial period, a one-time purchase of $3.00 unlocks all features permanently.
Trial Status
The remaining trial days are shown at the bottom of the main screen during the trial period.
Restoring Purchases
If you've previously purchased the app, you can restore your purchase:
1
Go to Settings
2
Tap "Restore Purchases" in the Purchase section