Round Zero
A fast, focused interval timer for HIIT, Tabata, EMOM, circuit training and boxing rounds.
Buy once · $0.99 · No subscription
Why it exists
Most free interval timers interrupt your session with a video ad between rounds, or lock
basic features behind a monthly subscription. Round Zero does neither. You pay once, and
the app is yours.
No ads, ever
Nothing interrupts a set. There is no ad code in the app at all.
No subscription
One purchase. No account, no sign-up, no upsell screen.
Fully offline
Works in airplane mode. The app never makes a network request.
What it does
- Custom intervals — work and rest from 5 seconds to 10 minutes, up to 100 rounds.
- Multi-cycle workouts — repeat a full round set, with rest between cycles.
- Warm-up and cooldown — optional phases at either end of a session.
- Audio and haptic cues — a countdown on the last three seconds of every phase.
- Plays over your music — cues layer on top instead of pausing your playlist.
- Locked-screen support — the timer keeps running and cueing when the screen is off.
- History and streaks — every session saved, with a weekly chart and streak counter.
- Five presets included — Tabata, HIIT 30/30, EMOM 10, Boxing Rounds, Core Circuit.
Privacy
Round Zero collects nothing. It requests no permissions, contains no analytics or tracking
code, and has no servers to send anything to. Your workouts and history stay on your device.
Read the full privacy policy.