HIIT Interval Timer | Cero vs Hi Timer

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/

Hi Timer, Your Personal Interval Training Companion Hi Timer makes it effortless to create and customise your own interval workouts. Whether you’re jumping into a quick Tabata session or building advanced routines like Circuits and Combinations, Hi Timer gives you the tools to stay on track and motivated. Hi Timer is designed to be simple enough for quick sessions, yet powerful enough to handle the most complex training routines. With its intuitive drag-and-drop interface, powerful customization options, and seamless background performance, Hi Timer helps you focus on your workout, not your phone. Featuring: - Quick Start Templates – Get moving right away with popular HIIT formats like Tabata. - Advanced Customisation – Build Circuits, Combinations, or fully custom routines with unlimited flexibility. - Drag & Drop Simplicity – Reorder intervals and sub-timers with ease. - Voice & Sound Cues – Interval names read aloud via text-to-speech, so you never need to glance at your screen. - Works in the Background – Keep your timer running with the screen locked or while using other apps. - Music Integration – Play your own tracks from Apple Music, your library, or other apps alongside your workout. - Smart Sounds – Choose start sounds, halfway alerts, and custom audio cues for every interval. - Cloud Sync & Sharing – Access your timers across devices or share them instantly with friends via a simple link. - HealthKit Integration – Save your completed workouts to Apple Health. This app is for timing only and does not provide medical or fitness advice. Consult a licensed healthcare professional before beginning any exercise program. This app contains optional in-app purchases that grant full access to unlimited timers and workouts, and the ability to share timers between devices. You may be offered a free trial for the Premium subscription. After the free trial period, if offered, the subscription automatically renews with the price and duration given above unless it is cancelled at least 24 hours before the end of the current period. Payment will be charged to your Apple ID account at the confirmation of purchase. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Removing the app doesn’t automatically cancel the subscription. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/