Square Wave: HIIT Timer

Square Wave is a focused, private interval timer for HIIT, Tabata, circuits, stretching, study sessions, and any routine built around work and rest. SET YOUR TIMER • Choose work and rest durations • Configure sets, rounds, and round breaks • Save favorite timer presets for quick reuse • See the total session time before you start FOLLOW THE WAVE Work is the high line. Rest is the low line. The live square wave makes the entire interval pattern easy to understand at a glance. • Large, readable countdowns • Pause or skip forward and back with one tap • Clear countdown, transition, and halfway cues • Optional sound and haptic feedback • Continues when the screen is locked APPLE WATCH Bring Square Wave to your wrist with the included Apple Watch app. • Start timers from presets synced with iPhone • Hear audio cues and feel haptic taps at each interval • Keep timing active when your wrist is down with workout support • Save completed workouts to Health and sync sessions back to iPhone MUSIC FRIENDLY Timer cues mix with Spotify and other audio instead of stopping your music. PRIVATE BY DESIGN No ads. No accounts. No subscriptions. No tracking. Square Wave works offline, and your saved timers stay on your device.