HIIT Interval Timer | Cero vs Interval Timer X Workout 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
Read full descriptionHide full description
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 X Workout Timer
This versatile timer helps you structure workouts, manage daily tasks, and achieve fitness goals. Customize routines, track progress with visual cues, and stay motivated with customizable sounds. Ideal for HIIT, Tabata, yoga, and more.
- Customizable workout routines
- Standalone interval timer/counter
- Routine combination feature
- Customizable warning sounds
- Intuitive interface with dark mode
- Background usage support
- Workout summary and history
Read full descriptionHide full description
Crafted with precision and simplicity, this interval/workout timer is designed for individuals who want to take control of their daily routines and achieve optimal results. Whether you're looking to build a custom workout routine or streamline your daily tasks, this interval timer is the perfect tool to help you reach your goals. Interval Timer features: • Customizable Routines: Setting up and saving your own routines has never been easier with our customizable function. • Multiple Functions: For simpler routines, access standalone interval timer/counter functions that can track every aspect of your workout. • Combination of routines: By combining existing routings, the combination feature has got you covered for all your interval tracking needs. • Warning Sound Setting: Stay on track during your workout with a warning sound that can be customized for circuit training, boxing, sprints, and more. • Intuitive Interface: The interface is simple and attractive with light and dark modes available to suit your preferences. Large display and colored progress bars enable you to track your workout from a distance. • Landscape Mode: The landscape mode provides an optional main display and a full-screen progress bar, making it even easier to track your progress. • Alarm Sounds: Choose from multiple alarm sounds including beep, boxing bell, singing bowl, and voice, to stay motivated throughout your workout. • Background Usage: Our app works seamlessly even when running in the background or when background music is on. • Summary after workout: Get a clear and simple summary of your sets and time when your workout is finished. • Calendar and Notification Feature: Use the calendar and notification function to plan your workouts in advance. • History: Help you track and improve your workouts. • Multiple Languages: The app supports multiple voice languages to cater to our global user base. Interval Timer Premium Features: • Export and Import: Easily export and import your custom routines and calendar. • Unlimited Routine Combinations: The premium version offers unlimited routine combinations, so you can create and save as many custom routines as you like. • Advanced Timer Settings: With more custom timer settings, including preparation time, cycle interval time, warning sound time, sound type for each event, and the ability to add short notes, you can fully customize your workout to suit your individual needs. • Customizable Notifications: The premium version also allows you to customize notification titles and content. This Interval Timer app is the perfect tool for anyone looking to optimize their daily routine and achieve their goals, whether you're into physical exercise, workouts, yoga, or meditation. Here are just a few examples of how our app can benefit you: - Physical Exercise: Keep track of your gym workouts, interval running, CrossFit training, and more with ease. - HIIT and Tabata: The app is specifically designed to track high-intensity interval training and Tabata workouts, helping you stay on track and achieve your fitness goals. - Yoga and Meditation: Use the app to time your yoga sessions or meditation practice and stay focused and motivated throughout your practice. - Productivity: Stay focused during your study sessions, reading time, or cooking with our Pomodoro clock functionality. - Personal Routines: Whether you're looking to optimize your daily routine or create a custom interval training plan, our app has got you covered. Take your workouts to the next level and achieve your goals with the Interval Timer X Workout Timer app. Try it today and experience the benefits for yourself!
Screenshots
Verdict
The clearest difference is update cadence: HIIT Interval Timer | Cero at every 3 days against Interval Timer X Workout Timer's every 6 weeks. Interval Timer X Workout Timer's advantage is review sentiment (94% vs 75%). On price, rating, ratings volume and ads 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 X Workout Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for HIIT Interval Timer | Cero against 4.8 for Interval Timer X Workout Timer. Both are backed by a comparable volume of ratings — 435 and 686 respectively. Written reviews are what separate them: 75% of HIIT Interval Timer | Cero's written reviews are positive against 94% of Interval Timer X Workout Timer's.
HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer X Workout Timer every 6 weeks. Both last shipped on September 29, 2026.
| Parameter | HIIT Interval Timer | Cero | Interval Timer X Workout Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (435 ratings) | 4.8 (686 ratings) — better |
| Positive reviews | 74.6% of reviews | 93.7% of reviews — better |
| Number of ratings | 435 | 686 — better |
| Update frequency | Every 3 days — better | Every 6 weeks |
| 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 |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 42 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Flawless Studio LLC | 世恬 颜 |
Customer experience
HIIT Interval Timer | Cero
Interval Timer X Workout 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 X Workout Timer
From 686 App Store ratingsWhat we love
- 🚀 Interval timer
- 👍 Easy to use
- 👍 Customizable
- 👍 Useful for workouts
- 👍 Reliable
Room to improve
- 💰 Ads in free version
- 🐛 Occasional bugs or crashes
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 X Workout Timer
Reported bugs
2 issues- Interval set index display issue
- Compatibility issues with older devices
Requested features
4 requests- Audio ducking for music playback
- Voice countdown
- Ability to store custom settings automatically
- Vibration option in addition to audio
In-app purchases
HIIT Interval Timer | Cero
- Cero Pro$3.99
Interval Timer X Workout Timer
- Interval Timer X Premium$6.99
Questions
Is HIIT Interval Timer | Cero free?
Is Interval Timer X Workout Timer free?
Which has better reviews, HIIT Interval Timer | Cero or Interval Timer X Workout Timer?
Do HIIT Interval Timer | Cero or Interval Timer X Workout Timer have ads?
Which is updated more often, HIIT Interval Timer | Cero or Interval Timer X Workout Timer?
Other comparisons















