Interval Timer for HIIT | Cero vs Alpha Progressive Overload

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/

Alpha Progressive Overload is a focused strength training tracker built for lifters who want to train hard, log fast, and make steady progress. Designed around progressive overload, Alpha Progressive Overload helps you track workouts, sets, reps, weight, rest periods, cardio, and training history without clutter or distractions. Supports app integration to post workouts to Strava and Apple Fitness. Features: • Fast set logging for weight, reps, and exercises • Custom workout splits and exercise organization • Rest timer with sound and notification support • Apple Watch companion support for quick workout tracking • Progress tracking for strength and training volume • Workout history and session summaries • Cardio logging • Apple Health workout integration • Strava sharing support • Light, dark, and system appearance modes • Optional motivational reminders Whether you are chasing PRs, rebuilding consistency, or just trying to stop guessing what you lifted last week, Alpha Progressive Overload gives you a simple place to track the work and keep moving forward. No ads. No social feed. No nonsense. No subscriptions. Just lifting, logging, and progress.