HIIT Interval Timer | Cero vs Interval Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HIIT Interval Timer | Cero
This interval timer app enhances various workouts like HIIT, Tabata, and yoga with intuitive design and customizable timer modes. Create and save custom intervals, track calorie expenditure, and sync settings across devices, including Apple Watch.
- Customizable interval timers
- Simple and advanced timer modes
- Create and save multiple workout settings
- Apple Watch compatibility with heart monitor
- Automatic calorie tracking to Apple Health
- Cross-device sync
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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/
Interval Timer
This app provides a customizable interval timer for various training routines, including HIIT and Tabata. Easily set up custom workouts, track your progress, and stay motivated with visual cues and audio notifications. It's suitable for a wide range of activities from fitness to productivity.
- Customizable workout setup
- Progress tracking with calendar
- Saveable custom presets
- Color-coded notifications
- Listen to music/audiobooks
- Large, full-screen display
- Widget for easy access
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Interval Timer: Tabata and HIIT is a customizable timer for sports. Use it for High-intensity interval training and workout. It's a free sports interval timer app that makes it easy to create your custom training routine. Use it as your timer for training or exercise. This sports timer is great for crossfit, fitness and running. The sports timer will also be useful for various activities such as crossfit, jogging, boxing,circuit training,breathing exercises and yoga. You can use this circuit timer as a productivity timer to focus on your work tasks. Key features: Setup workout Tracking your progress Customizable presets Notifications & colors Motivation Listening music or books Huge digits Widget SETUP WORKOUT Set up, edit and save your own workouts with the customizable feature. Add as many intervals as you like. You can add a 10 second rest period and a 20 second work period, as well as a 5 second interval between exercises. TRACKING PROGRESS Track your workouts with a Calendar. Plan and track events, and get notified when you have a training scheduled. With this feature, you will not miss a single workout and will keep track of your progress. CUSTOMIZABLE PRESETS Save your workouts in the presets section. It's also possible to create your own custom intervals. You can add an unlimited number of presets. NOTIFICATIONS & COLORS Each training phase is easy to distinguish by a different color and is initiated by an individually adjustable signal (sound, vibration, voice) MOTIVATION Each completed exercise motivates you to achieve higher goals. Enjoy your training and achieve your fitness goals with the interval timer. LISTENING MUSIC Listen to motivational audiobooks or your favorite music and get inspired and energized. Full screen color coded display is easy to read from a distance. Widget helps you train without being distracted by the constant unlocking of your phone. Interval Timer: Tabata and HIIT is an easy to use sports workout timer for your daily fitness training at home, at the gym or everywhere else.
Screenshots
Verdict
The clearest difference is update cadence: HIIT Interval Timer | Cero at every 3 days against Interval Timer's monthly. Interval Timer's advantage is review sentiment (97% vs 75%) and rating (4.9 vs 4.7). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. HIIT Interval Timer | Cero sells 1 one-off in-app purchase and Interval Timer sells 12 in-app purchases, starting at $2.09 per month. Whichever you choose, the download price is not the number that matters.
Interval Timer holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 435 and 379 respectively. Written reviews point the same way: 75% of HIIT Interval Timer | Cero's written reviews are positive against 97% of Interval Timer's.
HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer monthly. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.
| Parameter | HIIT Interval Timer | Cero | Interval Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (435 ratings) | 4.9 (379 ratings) — better |
| Positive reviews | 74.6% of reviews | 96.5% of reviews — better |
| Number of ratings | 435 — better | 379 |
| Update frequency | Every 3 days — better | Monthly |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 42 MB | 113 MB |
| Age rating | 4+ | 4+ |
| Developer | Flawless Studio LLC | SimpleInnovation LLC |
Customer experience
HIIT Interval Timer | Cero
Interval Timer
User reviews
HIIT Interval Timer | Cero
From 435 App Store ratingsWhat we love
- 👍 Simple and straightforward
- 👍 Very practical and customizable
- 👍 Great for HIIT and Tabata
- 👍 Clear design and easy to use
- 👍 Good value, no subscription
Room to improve
- 🔋 Drains battery
- 🎶 Music playback interrupted
- ⚠️ Ads interrupt timers
- 🔊 Weak or non-functional sound/haptics
- 🔄 Forced updates
Interval Timer
From 379 App Store ratingsWhat we love
- 👍 Simple and easy to use
- 🚀 Intuitive interface
- 🔋 Doesn't drain battery
- 💪 Effective for interval training
- 📆 Tracks workout history
Room to improve
- 🔔 Frequent prompts to rate the app
- 🔒 Concerns about data privacy and permissions
- 🔧 Limited customization options
Bugs and requests
HIIT Interval Timer | Cero
Reported bugs
4 issues- App runs in background draining battery
- Rotation broke after update
- Apple workout app overrides Cero app on Apple Watch
- Interval signals too weak or not working
Requested features
5 requests- Ability to group timers
- Option to add warm-up and cool-down features
- Ability to type numbers for time adjustment
- Timer sounds through headphones or interrupting music
- Ability to change exercise names
Interval Timer
Reported bugs
2 issues- Occasional app crashes
- Compatibility issues with older devices
Requested features
3 requests- More pre-designed workout routines
- Ability to name and customize exercises
- Option to adjust countdown time between intervals
In-app purchases
HIIT Interval Timer | Cero
- Cero Pro$3.99
Interval Timer
- Timer PRO for 1 month: 30% OFF7 Days trial$2.091 Month
- Timer PRO for 1 month: 25% OFF7 Days trial$2.291 Month
- Interval Timer PRO for 1 month$2.991 Month
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- Interval Timer PRO for 1 month7 Days trial$2.991 Month
- Interval Timer PRO - 30% OFF7 Days trial$15.001 Year
- Interval Timer PRO - 25% OFF7 Days trial$16.491 Year
- Interval Timer PRO for 1 year$21.991 Year
- Tabata Timer PRO for 1 year7 Days trial$21.991 Year
- Interval Timer - no Ads$2.99
- HIIT Timer PRO Forever 30% OFF$27.99
- HIIT Timer PRO Forever 25% OFF$29.99
Show 1 moreShow fewer
- Exercise Timer PRO Forever$39.99
Questions
Is HIIT Interval Timer | Cero free?
Is Interval Timer free?
Which has better reviews, HIIT Interval Timer | Cero or Interval Timer?
Do HIIT Interval Timer | Cero or Interval Timer have ads?
Which is updated more often, HIIT Interval Timer | Cero or Interval Timer?
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