HIIT Interval Timer | Cero vs Timer for Workouts

Build an interval workout around the way you train. Cero is a flexible interval timer for HIIT, Tabata, circuit training, WODs and HYROX preparation. Set up a quick work/rest timer or program each interval in detail. Distinct colors, large controls and reliable cues keep you focused on the session instead of the clock. BUILD YOUR SESSION • Set work, recovery, sets, warm-up and cool-down. • Create advanced workouts with custom intervals, colors, icons and intensity levels. • Save, duplicate and reorder timers. • Share timers by file or QR code. • Review completed sessions in workout history. STAY IN THE WORKOUT • Follow compatible sessions with Live Activities and Dynamic Island. • Start saved or recent timers from Home Screen widgets. • Use Siri and Shortcuts to start, pause, resume and stop a timer. • Put Gym Display on a larger screen or mirrored TV. • Choose a default song or assign music to individual intervals. • Customize sounds, voice cues, vibrations and background alerts. TRAIN BY HEART RATE Adaptive HR can extend recovery until you reach your target heart rate, then guide hard efforts with low and high alerts. Pair a Bluetooth heart-rate monitor with iPhone or train with heart-rate data from Apple Watch. COUNTDOWN AND STOPWATCH The built-in countdown and lap stopwatch cover warm-ups, station changes, rest periods and race-day practice. Stopwatch sessions continue after you close and reopen the app. ON APPLE WATCH Run saved workouts from your wrist, follow heart rate and use the standalone countdown and stopwatch. Cero can save completed workouts and estimated calories to Apple Health. Automatic iCloud backups help protect saved timers and custom intervals. Useful for HIIT, Tabata, circuits, EMOM-style workouts, boxing rounds, strength and conditioning, indoor cycling, running intervals and hybrid race preparation. Feedback and suggestions: hi@flawless.studio Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Transform your training with HIIT Timer — the simple interval timer and workout timer built for every level of fitness. Whether you lift in the gym, crush home circuits, or hit the road running, this HIIT timer creates powerful, personalized sessions in seconds. Set work, rest, and repeat intervals for tabata, EMOM, AMRAP, strength, mobility, or any exercise you choose. No fluff. Just fast, focused intervals. What You Can Do • Build custom HIIT and tabata workouts in a few taps • Save and repeat your favorite routines anytime • Stay on track with clear visual and voice cues • Track progress to see every flex and milestone Designed for efficiency, HIIT Timer makes every second count — from warm-up to cool-down — acting as the perfect timer for workouts of any length. Perfect For • Home training or full-body gym days • Running, cycling, rowing, bodyweight drills • Coaches and athletes who need a reliable interval clock Why It Works Structured interval training ignites metabolism, burns more calories, and builds endurance fast. HIIT Timer delivers the precision timing you need to stay consistent and get results you can flex. Download HIIT Timer today and train smarter. Your next sweat session starts with one tap. Have feedback or questions? Contact us in the app. Terms of Use: https://docs.google.com/document/d/1gLTzf9_jwmI0T46C_tdsgMxNqjS7jIdZBLtCXiidlhA/edit?usp=drive_link