Welcome to IntervalTimer Duo for macOS, a versatile dual-timer app perfect for interval training, the Pomodoro Technique, and any activity requiring timed intervals.
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 | ✓ | ✓ |
| Always on top | ✓ | ✓ |
| 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 | ✓ (first slot only) | ✓ |
| Send shared presets | — | ✓ |
| Set counter & target sets | — | ✓ |
| Compact mode (⌃⌥M) | — | ✓ |
| Window opacity | — | ✓ |
| Global keyboard shortcuts | — | ✓ |
The main window shows two timers:
Compact mode shrinks the window to a minimal size, perfect for keeping the timer visible while working. Use ⌃⌥M at any time to toggle it instantly. The window also resizes automatically when you collapse the presets section.
Send your favorite timer setups to anyone via a link. Recipients import the preset with a single click — even on the free tier.
The set counter lets you define a target number of sets and tracks your progress automatically — perfect for HIIT and circuit training.
Keep IntervalTimer visible above all other windows, even when working in other applications.
Control IntervalTimer Duo efficiently with keyboard shortcuts. Global shortcuts are a Premium feature.
Premium unlocks global keyboard shortcuts that work even when the app is in the background.
Access settings via the menu bar (IntervalTimer Duo → Settings) or ⌘ ,
Sounds: Decision / Warning are free; Bell / Trill / Marimba / Pop are Premium. Premium sounds show a padlock icon in the picker.
Customize global keyboard shortcuts for timer control (Premium feature). Free users see this panel disabled with an "Upgrade" banner.
The About tab includes a Contact & Feedback link that opens the Verbr support page where you can submit bug reports, feature requests, and other feedback.
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.
For the first 14 days after install, every Premium feature is unlocked. After the trial, the basics keep working forever — only Premium features lock until you upgrade.
Click any padlock icon on a Premium feature, or choose IntervalTimer Duo → Upgrade to Premium from the menu bar, to open the purchase screen. Review the price and feature list, then click Purchase for $2.99.
If you've previously purchased the app, click Restore Purchases in the Premium section of Settings.
Premium purchased on macOS automatically unlocks the iOS app for the same Apple ID, and vice versa. One purchase covers iPhone, iPad, and Mac.
If you have any questions or encounter any issues, please contact us:
Have a question, hit a bug, or want to request a feature? Get in touch here.