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 timers
Preset Management - Save and quickly load your favorite timer configurations (Free can play 1 built-in preset; Premium unlocks all built-in presets and lets you create unlimited presets)
Preset Sharing - Share timer setups via link; recipients import with one tap (Premium to send; free users can receive but only the first preset slot can be played)
Set Counter - Set a target number of sets and watch your progress (Premium)
Live Activity - View timer on Dynamic Island and Lock Screen (Premium)
Sound & Vibration Alerts - 6 sound options (4 of 6 are Premium)
iPad Optimized - Beautiful layout for both iPhone and iPad
Dark Mode - Seamless integration with iOS system appearance
Freemium Model (v1.1.0 and later)
IntervalTimer Duo is free forever for the basics. When you want pro features, unlock them with a single $2.99 one-time purchase. There's never a subscription.
14-day Premium trial: all Premium features are unlocked for the first 14 days after install. After the trial, the basics keep working forever — only Premium features lock until you make the one-time $2.99 purchase, or you can keep using the free tier indefinitely.
Feature
Free
Premium
Two alternating timers
✓
✓
Timer end alert sounds
2 (Decision / Warning)
All 6
Built-in presets playable
1 (HIIT only)
All built-ins
Custom presets
—
Unlimited
Receive shared presets via link
✓ (first slot only)
✓
Send shared presets via link
—
✓
Set counter & target sets
—
✓
Live Activity & Dynamic Island
—
✓
1. Getting Started
Installation
1
Download IntervalTimer Duo from the App Store
2
Open IntervalTimer Duo from your Home Screen
3
Start using the default HIIT preset (free) or upgrade to Premium to unlock other built-in presets and create your own
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 sequence
PAUSE - Pause the running timer
RESUME - Continue from where you paused
RESET - 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. Free users can play HIIT only; the other built-in presets and any presets you add are locked until you upgrade to Premium.
Preset Name
Timer 1
Timer 2
Free
HIIT
30 seconds
10 seconds
✓
Pomodoro
25 minutes
5 minutes
Premium
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
1Long 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.
Sharing a Preset (Premium)
Send your favorite timer setups to anyone via a link. Recipients import the preset with a single tap, even on the free tier.
1
Long-press the preset card to open the editor
2
Tap the share button (a padlock indicates Premium is required to send)
3
Send the link via Messages, Mail, social media, or any app
The recipient taps the link, the app opens with an import sheet, and tapping Add drops the preset into their list. Free users can receive shared presets, but only the first preset slot can be played; any additional received presets remain locked until they upgrade to Premium.
Set Counter (Premium)
The set counter lets you define a target number of sets and tracks your progress automatically — perfect for HIIT and circuit training.
1
Set Target Sets (1–99) in the preset editor
2
Start the preset; the set counter appears on the main screen
3
Each completed Timer 1 + Timer 2 cycle counts as one set
4
When you reach your target, the app plays a celebration animation
Tip: On the free tier, the target sets control shows a padlock icon and tapping it opens the upgrade screen.
4. Settings
Access settings by tapping the gear icon in the top right corner.
Choose from 6 different alert sounds for each timer:
Decision — Free
Warning — Free
Bell — Premium
Trill — Premium
Marimba — Premium
Pop — Premium
Use the preview button (speaker icon) to hear each sound before selecting. Premium sounds show a padlock icon in the picker; tapping a locked sound opens the upgrade screen.
Contact & Feedback
Tap the Contact & Feedback link near the bottom of the Settings screen to open the Verbr support page where you can submit bug reports, feature requests, and other feedback. The in-app review prompt also lets you share feedback after picking your satisfaction level.
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) (Premium)
A Premium feature. On supported devices, IntervalTimer Duo displays the current timer status on the Dynamic Island and Lock Screen.
How It Works
After purchasing Premium, enable Live Activity from the Settings screen link
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. Free users tapping the link see the upgrade screen.
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. Pricing & Purchase
IntervalTimer Duo uses a freemium model. The basics are free forever; Premium (the pro feature set) is a one-time $2.99 purchase. There is no subscription or recurring fee.
14-Day Premium Trial
For the first 14 days after install, every Premium feature is unlocked so you can try them in real workouts and work sessions. After the trial, the basics keep working forever — only Premium features lock until you upgrade.
Buying Premium
Tap any padlock icon on a Premium feature, or tap Upgrade to Premium at the bottom of Settings, to open the purchase screen. Review the price and feature list, then tap Purchase for $2.99.
Restoring Purchases
If you've previously purchased the app, you can restore your purchase:
1
Go to Settings
2
Tap Restore Purchases in the Premium section
Universal Purchase
Premium purchased on iOS automatically unlocks the macOS app for the same Apple ID, and vice versa. One purchase covers iPhone, iPad, and Mac.
Need Help?
If you have any questions or encounter any issues, please contact us: