ChronoSport vs Interval Timer for HIIT | Cero
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChronoSport
This app helps athletes track workout and rest times with customizable timers and a set counter. It provides alerts before time ends and allows device locking for uninterrupted training. Designed for various sports, it aims to give users control over their performance.
- Customizable timers
- Set counter
- End-of-timer alerts
- Device lock support
- Workout performance tracking
Read full descriptionHide full description
Bodybuilding, Fitness, CrossFit, Yoga, Boxing ... Regardless your sport, rigor is synonymous with progress. Everything have to be controlled, starting by your effort and rest times. ChronoSport supports yourself during your workouts to always have control over your performances. -- TIMERS -- Customize your own timers and launch them to start your training. Beeps will alert you a few seconds before the end of the elapsed time. You can lock your device, a notification warns you at the end of the timer. -- SETS COUNTER -- Keep control of your workout with the sets counter that tells you where you are in your training. Choose to display either the sets completed or the sets you have yet to complete according to your sport. ChronoSport has been created for all athletes to offer them the perfect tool for their trainings. Feel free to leave a review by giving your suggestions. Your valuable feedback allows the application to evolve.
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.
- 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/
Screenshots
Verdict
The clearest difference is update cadence: Interval Timer for HIIT | Cero at every 3 days against ChronoSport's every 4 months. Interval Timer for HIIT | Cero also leads on ratings volume (437 vs 43) and device support (3 vs 1). ChronoSport's advantage is review sentiment (85% vs 75%). On price, rating, 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. ChronoSport sells 4 one-off in-app purchases and Interval Timer for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.6 for ChronoSport against 4.7 for Interval Timer for HIIT | Cero. That said, the two scores are not equally well evidenced: Interval Timer for HIIT | Cero has 437 ratings behind it against 43, so its average is the more settled of the two. Written reviews are what separate them: 85% of ChronoSport's written reviews are positive against 75% of Interval Timer for HIIT | Cero's.
ChronoSport ships an update every 4 months, Interval Timer for HIIT | Cero every 3 days. The most recent releases landed on October 23, 2026 and October 29, 2026 respectively.
| Parameter | ChronoSport | Interval Timer for HIIT | Cero |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (43 ratings) | 4.7 (437 ratings) — better |
| Positive reviews | 85.5% of reviews — better | 74.6% of reviews |
| Number of ratings | 43 | 437 — better |
| Update frequency | Every 4 months | Every 3 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, Apple Watch — better |
| Requires iOS | 16.4 | 16.0 — better |
| Further details — not scored | ||
| Size | 120 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Lilian SUZAN | Flawless Studio LLC |
Customer experience
ChronoSport
Interval Timer for HIIT | Cero
Bugs and requests
ChronoSport
Not enough reviews yet to summarise bugs or 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
In-app purchases
ChronoSport
- Disable ads$1.99
- Chronosport Support Gift$2.99
- Chronosport Support Gift$4.99
Show 1 moreShow fewer
- Chronosport Support Gift$17.99
Interval Timer for HIIT | Cero
- Cero Pro Monthly7 Days trial$2.991 Month
- Cero Pro$14.99
Questions
Is ChronoSport free?
Is Interval Timer for HIIT | Cero free?
Which has better reviews, ChronoSport or Interval Timer for HIIT | Cero?
Do ChronoSport or Interval Timer for HIIT | Cero have ads?
Which is updated more often, ChronoSport or Interval Timer for HIIT | Cero?
Other comparisons















