HIIT Interval Timer | Cero vs HC HIIT 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/
HC HIIT Interval Timer
Create and manage custom interval training workouts with an integrated timer. Design workouts with specific actions, colors, names, and durations. Suitable for personal training or individual fitness routines.
- Create custom workouts
- Integrated workout timer
- Define actions with color, name, and duration
- Use default workouts
- Save and reuse workout routines
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This application is made by volunteers, trying to help their trainer to make things easy with their workouts for the members of the Health Club from Novi Sad, Serbia, but it can be used by anyone on the App Store! With HC HIIT Interval Timer you can keep your workouts simple and in one place with an integrated timer inside every action of workout. The goal of the application is to prepare workouts that can be used later for training. You can freely use the default workouts from the application, and you can make new ones for yourself. The main features of the application are adding and using workouts. Every workout is built from actions. Every action has color, name, and number of seconds for action. We wish you to create your best workouts and maintain your health!
Screenshots
Verdict
The clearest difference is rating: HIIT Interval Timer | Cero at 4.7 against HC HIIT Interval Timer's 4.2. HIIT Interval Timer | Cero also leads on update cadence (every 3 days vs every 21 months) and ratings volume (435 vs 5). HC HIIT Interval Timer's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and iOS requirement 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 2 in-app purchases, starting at $2.99 per month. HC HIIT Interval Timer asks for nothing beyond the download.
HIIT Interval Timer | Cero holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 75% of HIIT Interval Timer | Cero's written reviews are positive against 100% of HC HIIT Interval Timer's, so the app with the better star average is not the one people write more warmly about.
HIIT Interval Timer | Cero ships an update every 3 days, HC HIIT Interval Timer every 21 months. The most recent releases landed on October 16, 2026 and September 26, 2026 respectively.
| Parameter | HIIT Interval Timer | Cero | HC HIIT Interval Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (435 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 74.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 435 — better | 5 |
| Update frequency | Every 3 days — better | Every 21 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 42 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Flawless Studio LLC | Dejan Dragic |
Customer experience
HIIT Interval Timer | Cero
HC HIIT Interval Timer
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
HC HIIT Interval Timer
Not enough reviews yet to summarise bugs or requests.
In-app purchases
HIIT Interval Timer | Cero
- Cero Pro Monthly7 Days trial$2.991 Month
- Cero Pro$14.99
HC HIIT Interval Timer
No in-app purchases
Questions
Is HIIT Interval Timer | Cero free?
Is HC HIIT Interval Timer free?
Which has better reviews, HIIT Interval Timer | Cero or HC HIIT Interval Timer?
Do HIIT Interval Timer | Cero or HC HIIT Interval Timer have ads?
Which is updated more often, HIIT Interval Timer | Cero or HC HIIT Interval Timer?
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