Interval Timer for HIIT | Cero vs ASCEND

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/

ASCEND is a training and recovery companion built to help you stay consistent, train with more clarity, and understand how your body is responding over time. Whether you're lifting regularly, mixing strength with cardio, or trying to build better habits, ASCEND gives you a cleaner way to log sessions, check in with recovery, and spot meaningful patterns in your progress. With ASCEND, you can: • Log strength, cardio, and hybrid training sessions • Track daily recovery and body feedback • Build a clearer picture of consistency over time • Review performance trends and training history • Use guided coaching prompts for grounded reflection and support ASCEND is designed to feel useful from the start. The core experience focuses on helping you build trust in your own training data before adding deeper layers of personalization. Premium access is designed to expand the experience further with richer coaching, deeper insight, and more advanced support over time. If you want a training app that feels focused, calm, and genuinely useful, ASCEND is built for that path. Terms of Use: https://ascend-legal.vercel.app/ascend/terms/ Privacy Policy: https://ascend-legal.vercel.app/ascend/privacy/