An interval training timer for iPhone and Apple Watch. Support and contact.
Questions, bug reports and feature requests are welcome at hiitimer.app@gmail.com. Please mention your iPhone model and iOS version if you are reporting a problem — it makes it far easier to reproduce.
Yes. HIITimer keeps its audio session active for the whole workout so the pre-alert and the 3-2-1 countdown arrive on time even with the phone locked and in your pocket. The Lock Screen also shows a Live Activity with the remaining time.
That is iOS saving power on the always-on display: it hides the seconds and updates the minutes once a minute. Wake the screen and the seconds reappear. Apple's own Timer app behaves the same way.
No. The app mixes its cues with whatever you are listening to and never lowers the volume of your music. If the cues are hard to hear over a loud track, raise the cue level in the Sound section.
Open the app, go to the purchase screen and tap Restore purchases. Make sure you are signed in with the same Apple Account you bought with. If that does not help, email us.
No. Pro is a one-time purchase. There is no subscription, no renewal and nothing to cancel.
Yes, completely. HIITimer never needs a connection at all — there is no account, no sync and no advertising. Put the phone in flight mode and everything works exactly as before.