Comparison

Interval Timer for HIIT | 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.

Head to head
About

Interval Timer for HIIT | 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.

Highlights
  • 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
Features
Read 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/

About

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.

Highlights
  • 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
Features
Read 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

Interval Timer for HIIT | Cero4 screens

Verdict

The call

The clearest difference is update cadence: Interval Timer for HIIT | 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Interval Timer for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Interval Timer for HIIT | Cero against 4.8 for Interval Timer X Workout Timer. Both are backed by a comparable volume of ratings — 436 and 686 respectively. Written reviews are what separate them: 75% of Interval Timer for HIIT | Cero's written reviews are positive against 94% of Interval Timer X Workout Timer's.

UpkeepUpdate frequency

Interval Timer for HIIT | Cero ships an update every 3 days, Interval Timer X Workout Timer every 6 weeks. The most recent releases landed on October 20, 2026 and October 13, 2026 respectively.

Scorecard2 real differences · 8 level
Interval Timer for HIIT | Cero versus Interval Timer X Workout Timer: the parameters behind the verdict, then further details
ParameterInterval Timer for HIIT | CeroInterval Timer X Workout Timer
PriceFreeFree
Rating4.7 (436 ratings)4.8 (686 ratings) — better
Positive reviews74.6% of reviews93.7% of reviews — better
Number of ratings436686 — better
Update frequencyEvery 3 days — betterEvery 6 weeks
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS16.015.6 — better
Further details — not scored
Size42 MB45 MB
Age rating4+4+
DeveloperFlawless Studio LLC世恬 颜

Customer experience

Interval Timer for HIIT | Cero

All ratings436 ratings
Positive92.9%
Neutral3.9%
Negative3.2%
Written reviews59 reviews
Positive74.6%
Neutral10.2%
Negative15.3%

Interval Timer X Workout Timer

All ratings672 ratings
Positive95.1%
Neutral2.4%
Negative2.5%
Written reviews63 reviews
Positive93.7%
Neutral3.2%
Negative3.2%

User reviews

Interval Timer for HIIT | Cero

From 436 App Store ratings

What 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 ratings

What 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

Interval Timer for HIIT | 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

2 purchases

Interval Timer for HIIT | Cero

Subscriptions1
  • Cero Pro Monthly7 Days trial$2.991 Month
One-time1
  • Cero Pro$14.99
1 purchases

Interval Timer X Workout Timer

One-time1
  • Interval Timer X Premium$6.99

Questions

Is Interval Timer for HIIT | Cero free?
Interval Timer for HIIT | Cero is free to download, with in-app purchases available.
Is Interval Timer X Workout Timer free?
Interval Timer X Workout Timer is free to download, with in-app purchases available.
Which has better reviews, Interval Timer for HIIT | Cero or Interval Timer X Workout Timer?
Interval Timer X Workout Timer is rated higher. Interval Timer for HIIT | Cero averages 4.7 out of 5 from 436 ratings, while Interval Timer X Workout Timer averages 4.8 from 686 ratings.
Do Interval Timer for HIIT | Cero or Interval Timer X Workout Timer have ads?
Both Interval Timer for HIIT | Cero and Interval Timer X Workout Timer show ads.
Which is updated more often, Interval Timer for HIIT | Cero or Interval Timer X Workout Timer?
Interval Timer for HIIT | Cero ships an update every 3 days, and Interval Timer X Workout Timer every 6 weeks. Most recently, Interval Timer for HIIT | Cero was updated on October 20, 2026 and Interval Timer X Workout Timer on October 13, 2026.

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