Intervo: HIIT Interval Timer

If you train in intervals — HIIT, Tabata, EMOM, boxing rounds, a quick circuit — you are usually moving, not watching a screen. Intervo is an interval timer built around that. Every phase change is a distinct vibration you feel without looking: a sharp double-pulse for work, a soft single for rest, a light count-in for the last three seconds, and a ramp at the finish, backed by audio cues.

It keeps the screen awake so the countdown is there whenever you do glance down, and it ducks your own music for a cue rather than stopping it. The clock is anchored to real wall-clock time, so taking a call or switching apps mid-set won't leave the timer drifting out of sync.

Five formats are ready the moment you open it, from Tabata to three-round boxing, and the editor lets you build your own — add steps, drag to reorder, set each duration, label them, and choose the repeats and rest between sets, with the total time updating as you go.

It is $0.99 once. No ads, no subscription, no account, and no network connection at all — your workouts and preferences live on the phone and nothing is collected.