Comparison

HIIT Interval Timer | Cero vs Burn It

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 | 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

Burn It

This interval timer app is designed for circuit training, group classes, and independent practice. It allows users to create custom workouts or utilize pre-set Tabata routines. The app also includes a stopwatch and a simple, intuitive interface for effective training sessions.

Highlights
  • Customizable interval workouts
  • Pre-set Tabata routines
  • Stopwatch functionality
  • Group class timer
  • Simple interface
  • Intuitive controls
Features
Read full description

Burn IT is a convenient and simple interval timer for circuit training. The timer helps to conduct group classes and practices independently. Set up your own workouts for free or run a tabata workout. Training is installed in the application by default. This timer will help you complete your scheduled workouts with a sense of pride in yourself. And if you are a coach, then save all the necessary workouts in the application and use the timer as a tool at work. The timer will help if you practice: - high-intensity workouts - crossfit training - training according to the Tabata protocol - martial arts - yoga and meditative practices - fitness exercises and yoga - interval and circular training Such trainings make it possible to feel the strength and endurance of your own body. In addition to the designer in the application there is a stopwatch. The timer is distributed for free, there is no advertising in the application during the workout. The application has a simple interface and intuitive control.

Screenshots

HIIT Interval Timer | Cero4 screens
Burn It4 screens

Verdict

The call

The clearest difference is rating: HIIT Interval Timer | Cero at 4.7 against Burn It's 3.8. HIIT Interval Timer | Cero also leads on update cadence (every 3 days vs every 3 months) and ratings volume (435 vs 4). Burn It's advantage is ads (none vs shown) and review sentiment (84% vs 75%). On price, in-app purchases, monetization model and device support 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 | Cero sells 2 in-app purchases, starting at $2.99 per month and Burn It sells 4 one-off in-app purchases. 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 3.8. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 4, 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 84% of Burn It's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HIIT Interval Timer | Cero ships an update every 3 days, Burn It every 3 months. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.

Scorecard6 real differences · 4 level
HIIT Interval Timer | Cero versus Burn It: the parameters behind the verdict, then further details
ParameterHIIT Interval Timer | CeroBurn It
PriceFreeFree
Rating4.7 (435 ratings) — better3.8 (4 ratings)
Positive reviews74.6% of reviews84.4% of reviews — better
Number of ratings435 — better4
Update frequencyEvery 3 days — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPod
Requires iOS16.012.1 — better
Further details — not scored
Size43 MB23 MB
Age rating4+4+
DeveloperFlawless Studio LLCRoman Nikolaev

Customer experience

HIIT Interval Timer | Cero

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

Burn It

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews32 reviews
Positive84.4%
Neutral12.5%
Negative3.1%

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

Burn It

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

HIIT Interval Timer | Cero

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

Burn It

One-time4
  • BurnIt Pro - Discount 75%$0.99
  • BurnIt Pro - Discount 50%$1.99
  • BurnIt Pro - Discount 25%$2.99
Show 1 more
  • BurnIt Pro$3.99

Questions

Is HIIT Interval Timer | Cero free?
HIIT Interval Timer | Cero is free to download, with in-app purchases available.
Is Burn It free?
Burn It is free to download, with in-app purchases available.
Which has better reviews, HIIT Interval Timer | Cero or Burn It?
HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Burn It averages 3.8 from 4 ratings.
Do HIIT Interval Timer | Cero or Burn It have ads?
HIIT Interval Timer | Cero shows ads; Burn It does not.
Which is updated more often, HIIT Interval Timer | Cero or Burn It?
HIIT Interval Timer | Cero ships an update every 3 days, and Burn It every 3 months. Most recently, HIIT Interval Timer | Cero was updated on October 12, 2026 and Burn It on October 5, 2026.

Other comparisons