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 helps you structure workouts with customizable timers for high-intensity intervals and rest periods. Track your progress, create personalized training plans, or use recommendations to achieve fitness goals. Enhance your sessions with customizable themes, sounds, and voiceovers.
- Customizable interval timers
- Workout logging
- Personalized training programs
- Recommended routines
- Customizable themes and sounds
- Multiple voiceover options
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An easy-to-use timer app useful for gym and home workouts and for separating periods of high activity and rest to stay most productive during your day. Create your own training programs or use our recommendations to suit your goals. Keep a daily workout log and motivate yourself to achieve new goals. Many options for customizing the appearance of the application, such as color themes, sounds and multiple voiceover choises. You will never miss a signal again. With this app you can get in shape, lose weight, keep a clear and focused mind and became more healthfull person. Privacy policy: https://timer.works/privacy.html Terms of Use: https://timer.works/terms.html
Screenshots
Verdict
The clearest difference is ads: Interval timer at none against HIIT Interval Timer | Cero's shown. Interval timer also leads on update cadence (daily vs every 3 days) and iOS requirement (14.0 vs 16.0). HIIT Interval Timer | Cero's advantage is ratings volume (435 vs 37). On price, rating, in-app purchases and monetization model 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 and Interval timer sells 3 in-app purchases, starting at $2.49 per 7 days. 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. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 37, so its average is the more settled of the two.
HIIT Interval Timer | Cero ships an update every 3 days, Interval timer daily. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.
| Parameter | HIIT Interval Timer | Cero | Interval timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (435 ratings) | 4.8 (37 ratings) — better |
| Positive reviews | 74.6% of reviews | — |
| Number of ratings | 435 — better | 37 |
| Update frequency | Every 3 days | Daily — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 16.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 42 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Flawless Studio LLC | Dmitriy Beloglazov |
Customer experience
HIIT Interval Timer | Cero
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
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
Interval timer
- Premium - Week3 Days trial$2.497 Days
- Premium - Month3 Days trial$5.991 Month
- Premium - Year$19.491 Year
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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