Comparison

HIIT Interval Timer vs HIIT Interval Timer | Cero

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HIIT Interval Timer

This app provides a flexible interval timer for high-intensity training. Customize workout cycles, rest periods, and receive color, voice, and sound navigation cues. It runs in the background and offers a built-in music player.

Highlights
  • Customizable interval and rest times
  • Background and screen-locked operation
  • Color, voice, and sound navigation
  • Built-in music player
  • Create and manage custom timers
  • Multiple themes
Features
Read full description

Run in foreground, background and screen locked, the HIIT app allows you to specify an overall time as well as program High/Low intensity interval and rest time between cycles. + Flexible and Advanced Timer + Clean, simple and easy to use (There is no learning curve here) + Create your own timers with some taps + Create fully customized timers with a complex of cycles and sets, + Run in the background, foreground, screen locked + Color, Voice and Sound Navigations (Customizable) + Built in Music Player (in sync with iOS Music Player) + Multiple themes to select + Manage your timers and data of training (you can even delete unwanted timer or junk data) + Create your own alarms right in the app + Work on iPhone, iPad and iPod + And a lot more features will be added in over time. How to use this app: There is no user manual here! -> Download it -> tap on play button -> you will see -> It’s super easy

About

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.

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/

Screenshots

HIIT Interval Timer4 screens
HIIT Interval Timer | Cero4 screens

Verdict

The call

The clearest difference is rating: HIIT Interval Timer | Cero at 4.7 against HIIT Interval Timer's 4.2. HIIT Interval Timer | Cero also leads on update cadence (every 3 days vs every 5 months) and review sentiment (75% vs 53%). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. HIIT Interval Timer sells 1 one-off in-app purchase and HIIT Interval Timer | Cero 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

HIIT Interval Timer | Cero holds the better App Store score, 4.7 against 4.2. Both are backed by a comparable volume of ratings — 102 and 435 respectively. Written reviews point the same way: 53% of HIIT Interval Timer's written reviews are positive against 75% of HIIT Interval Timer | Cero's.

UpkeepUpdate frequency

HIIT Interval Timer ships an update every 5 months, HIIT Interval Timer | Cero every 3 days. The most recent releases landed on September 17, 2026 and September 25, 2026 respectively.

Scorecard4 real differences · 6 level
HIIT Interval Timer versus HIIT Interval Timer | Cero: the parameters behind the verdict, then further details
ParameterHIIT Interval TimerHIIT Interval Timer | Cero
PriceFreeFree
Rating4.2 (102 ratings)4.7 (435 ratings) — better
Positive reviews52.6% of reviews74.6% of reviews — better
Number of ratings102435 — better
Update frequencyEvery 5 monthsEvery 3 days — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.6 — better16.0
Further details — not scored
Size10 MB42 MB
Age rating4+4+
DeveloperThang NguyenFlawless Studio LLC

Customer experience

HIIT Interval Timer

All ratings102 ratings
Positive78.4%
Neutral7.8%
Negative13.7%
Written reviews19 reviews
Positive52.6%
Neutral10.5%
Negative36.8%

HIIT Interval Timer | Cero

All ratings435 ratings
Positive92.9%
Neutral3.9%
Negative3.2%
Written reviews59 reviews
Positive74.6%
Neutral10.2%
Negative15.3%

Bugs and requests

HIIT Interval Timer

Not enough reviews yet to summarise bugs or 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

In-app purchases

1 purchases

HIIT Interval Timer

One-time1
  • Pro Upgrade$4.99
1 purchases

HIIT Interval Timer | Cero

One-time1
  • Cero Pro$3.99

Questions

Is HIIT Interval Timer free?
HIIT Interval Timer is free to download, with in-app purchases available.
Is HIIT Interval Timer | Cero free?
HIIT Interval Timer | Cero is free to download, with in-app purchases available.
Which has better reviews, HIIT Interval Timer or HIIT Interval Timer | Cero?
HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer averages 4.2 out of 5 from 102 ratings, while HIIT Interval Timer | Cero averages 4.7 from 435 ratings.
Do HIIT Interval Timer or HIIT Interval Timer | Cero have ads?
Both HIIT Interval Timer and HIIT Interval Timer | Cero show ads.
Which is updated more often, HIIT Interval Timer or HIIT Interval Timer | Cero?
HIIT Interval Timer ships an update every 5 months, and HIIT Interval Timer | Cero every 3 days. Most recently, HIIT Interval Timer was updated on September 17, 2026 and HIIT Interval Timer | Cero on September 25, 2026.

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