SQNZ
Interval timer for iPhone and Apple Watch.
You set work and rest, the app counts down for you. For HIIT, Tabata, circuits and boxing rounds. No account. Timers run without an internet connection.
For iPhone 11 or later and iPhone SE (2nd generation) or later. On Apple Watch from Series 6, SE (2nd generation) and every Ultra, together with SQNZ Premium on your iPhone. · FAQ
Coming soon
SQNZ
Support
We're happy to help.
Contact
Have a question, found a bug, or want to suggest a feature?
support@casystudio.comQuestions about privacy, access to your data or deletion? We handle those separately — see the Privacy Policy. Write to the same address with “Privacy” in the subject line.
FAQ
How do I create a timer?
Tap “+ New” on the home screen. Choose “Timer Builder” to build a timer step by step, or “Create from text”.
How does the AI help work?
SQNZ copies a prepared prompt to your clipboard and, on request, opens your AI app (e.g. ChatGPT or Claude). There you describe your workout and copy the result back into SQNZ, which converts the text into a timer locally. The app itself sends no text to any AI service.
How do I sync with my Apple Watch?
The Apple Watch app requires Premium. Pair your watch with your iPhone as usual and install SQNZ on the watch. SQNZ syncs timers, favorites and statistics through Apple's connection between iPhone and watch, without any server of ours.
Does the timer pause automatically on a call?
Yes. When a call comes in, a running timer pauses on iPhone and on Apple Watch.
How do I share a timer?
Open a timer and use the share function. It goes out as a file (.sqtimer); the other person opens it to import the timer.
How do I restore my purchase?
Open Settings and tap “Restore purchases” on the Premium card at the top. Use the same Apple ID you used for the original purchase.
Is Premium a subscription?
Premium is a one-time purchase, not a subscription. There is nothing to cancel. You manage purchases through your Apple ID.
How do I delete my data?
Under Settings > My Data you delete timers, flows and your workout history; the bundled templates are restored. So you can undo it, SQNZ keeps the last three states as a copy on the device. The data is only gone for good once you delete the app: iOS then deletes its data. Two keychain entries on this device remain (Premium unlocked, acknowledgement of the hearing notice), as does everything SQNZ wrote to Apple Health, which you delete in Apple Health or under My Data with “Delete all sessions saved by SQNZ”.
Does SQNZ need an internet connection?
No, timers run without an internet connection. SQNZ itself sends no data to any server. You only need internet to buy Premium through Apple and to create a timer with ChatGPT or Claude.
Is anything missing on older devices?
No, SQNZ works the same on all listed devices. The only exception: double tap for Pause and GO, for Stop at the end of a timer and for Done needs Apple Watch Series 9, Ultra 2 or SE 3. On older watches you tap the button on the screen.