IntervalFlow: HIIT Timer

IntervalFlow is a beautifully simple HIIT and interval timer — and every feature is free. No paywalls. No forced ads in the middle of your workout. Just a fast, focused timer that gets out of your way so you can train. WHY INTERVALFLOW • Everything free — custom intervals, unlimited presets, stats. Nothing locked behind a subscription. • Live Activity & Dynamic Island — your current phase, countdown, and round stay on the Lock Screen and Dynamic Island. Glance mid-set without unlocking. • No interruptions — a small banner and optional rewarded ads only. Never a forced full-screen ad while you're working out. BUILT FOR REAL WORKOUTS • Ready-made presets: Tabata, HIIT 40/20, EMOM, Boxing rounds, and multi-set circuits. • Custom builder: set prepare, work, rest, rounds, sets, rest between sets, and cooldown — in seconds. • Big, clear countdown with color-coded phases (work, rest, get ready, cooldown). • Sound, haptics, and optional voice cues so you can keep your eyes off the screen. TRACKS ITSELF • Every finished session is logged automatically — time, rounds, and estimated calories. • Daily streak and weekly count to keep you consistent. Perfect for HIIT, Tabata, cross-training, boxing, running intervals, stretching, EMOM, and circuit training — at the gym or at home. Download IntervalFlow and start your first interval in seconds. Free, forever.