Square Wave: HIIT Timer

Square Wave is an interval timer built on one idea: your whole workout, drawn as a square wave. Work is the high line. Rest is the low line. A glowing dot rides the wave in real time, so you always know exactly where you are. Set your work time, rest time, sets, rounds, and round breaks. Hit start. That's it. MADE FOR REAL WORKOUTS • Loud, clear 3-2-1 countdown beeps and a distinct go sound at zero • A halfway tick during work intervals so you can pace yourself • Beeps keep working with the screen locked, and they mix over your music or videos instead of interrupting them • Giant numerals you can read from across the room • Set and round counters always in view • A 10-second get-ready lead-in before the first interval SIMPLE ON PURPOSE • Save your favorite timers and switch instantly • Pause, skip forward or back, and mute with one tap • Five numbers and a start button. No settings maze. FREE MEANS FREE No ads. No accounts. No subscriptions. No tracking. The app never connects to the internet — your timers stay on your device.