Comparison

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

Interval Timer

This app helps you manage workout intervals with customizable work and rest periods. It runs in the background and allows music playback, with options to save settings and share progress. Integrates with Apple Health for heart rate monitoring.

Highlights
  • Customizable sets, intervals, and rest times
  • Runs in background and with screen locked
  • Music playlist integration
  • Save settings as templates
  • Apple Health integration for heart rate
  • Post workouts to social media
Features
Read full description

***Free and reliable. Perfect for use at home, at the track or in the gym. We’re proud to introduce this handy little app that helps you keep track of your work and rest periods during workouts. Whether your into cycling, running, lifting weights, exercise, workout, stretching, boxing, MMA or HIT, this interval timer will prove to be an invaluable asset to you. Running foreground, background or with device locked, this reliable app allows you specify an overall time as well as program High/Low intensity interval and rest time between sets. Produced by Polycents! Key Features: - Customizable sets, high/low intensity interval and rest for your own need - Retina display, iOS4 and multitasking - Continue to run even when screen is locked - Play your song or playlist during your workout - Post your workout to Facebook or Twitter - Save settings as templates Customizable Features: - Number of Sets - Countdown Time - Set Time - Low Interval time - High Interval time - Rest Time - First Interval (low or high) - Sound Volume - Timer Sounds - Auto Lock - Vibrate - Pause during Rest - Playlist - New Each Set APPLE HEALTH: -Interval Timer can use Apple Health to show heart rate in Apple Watch App. # Subscription Details # - Monthly and annual subscriptions are available. - Payment will be charged to your iTunes account at confirmation of purchase. - Your subscription will automatically renew unless auto-renew is disabled at least 24 hours before the end of the current subscription period. - Automatic renewals will be charged at the same price you were originally charged for the subscription. - Subscriptions can be managed by going to Account Settings on the App Store after purchase. Terms of Use: https://www.iubenda.com/terms-and-conditions/18915396 Privacy Policy: https://www.iubenda.com/privacy-policy/18915396

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

Interval Timer4 screens
HIIT Interval Timer | Cero4 screens

Verdict

The call

The clearest difference is ratings volume: Interval Timer at 19K against HIIT Interval Timer | Cero's 435. Interval Timer also leads on iOS requirement (13.0 vs 16.0). HIIT Interval Timer | Cero's advantage is rating (4.7 vs 4.5). On price, review sentiment, update cadence and ads 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. Interval Timer sells 6 in-app purchases, starting at $0.99 per month 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 4.5. That said, the two scores are not equally well evidenced: Interval Timer has 19K ratings behind it against 435, so its average is the more settled of the two. Written reviews point the same way: 69% of Interval Timer's written reviews are positive against 75% of HIIT Interval Timer | Cero's.

UpkeepUpdate frequency

Interval Timer ships an update every 9 days, HIIT Interval Timer | Cero every 2 weeks. The most recent releases landed on September 24, 2026 and September 20, 2026 respectively.

Scorecard3 real differences · 7 level
Interval Timer versus HIIT Interval Timer | Cero: the parameters behind the verdict, then further details
ParameterInterval TimerHIIT Interval Timer | Cero
PriceFreeFree
Rating4.5 (19K ratings)4.7 (435 ratings) — better
Positive reviews69.0% of reviews74.6% of reviews — better
Number of ratings19K — better435
Update frequencyEvery 9 days — betterEvery 2 weeks
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS13.0 — better16.0
Further details — not scored
Size143 MB42 MB
Age rating4+4+
DeveloperNEO PIXEL LABS PTE. LTD.Flawless Studio LLC

Customer experience

Interval Timer

All ratings19,032 ratings
Positive88.4%
Neutral3.3%
Negative8.3%
Written reviews1,236 reviews
Positive69.0%
Neutral5.7%
Negative25.2%

HIIT Interval Timer | Cero

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

User reviews

Interval Timer

From 19K App Store ratings

What we love

  • 🚀 Free version works well
  • 👍 Customizable intervals and timers
  • 👍 Flexible for different workouts
  • 👍 Easy to use and set up
  • 👍 Provides visual and audio cues

Room to improve

  • 🐛 Timer issues (stops, loses time)
  • 🔋 Drains battery when used
  • 💰 Expensive subscription model
  • 📢 Intrusive ads
  • 🔒 Incompatible with other apps

HIIT Interval Timer | Cero

From 435 App Store ratings

What we love

  • 👍 Simple and straightforward
  • 👍 Very practical and customizable
  • 👍 Great for HIIT and Tabata
  • 👍 Clear design and easy to use
  • 👍 Good value, no subscription

Room to improve

  • 🔋 Drains battery
  • 🎶 Music playback interrupted
  • ⚠️ Ads interrupt timers
  • 🔊 Weak or non-functional sound/haptics
  • 🔄 Forced updates

Bugs and requests

Interval Timer

Reported bugs

3 issues
  • Ads block functionality
  • App freezes or crashes
  • Timer doesn't work in background

Requested features

5 requests
  • Add notes to workouts
  • Provide workout history and analytics
  • Allow syncing with Apple Health
  • Improve Apple Watch integration
  • Add more customization options

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

6 purchases

Interval Timer

Subscriptions6
  • Plus - 1 Month$0.991 Month
  • Premium - 1 Month$1.991 Month
  • Plus - 1 Month$1.991 Month
Show 3 more
  • Premium - 1 Month$2.991 Month
  • Plus - 1 Year2 variants$4.991 Year
  • Premium - 1 Year7 Days trial2 variants$9.991 Year
1 purchases

HIIT Interval Timer | Cero

One-time1
  • Cero Pro$3.99

Questions

Is Interval Timer free?
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, Interval Timer or HIIT Interval Timer | Cero?
HIIT Interval Timer | Cero is rated higher. Interval Timer averages 4.5 out of 5 from 19K ratings, while HIIT Interval Timer | Cero averages 4.7 from 435 ratings.
Do Interval Timer or HIIT Interval Timer | Cero have ads?
Both Interval Timer and HIIT Interval Timer | Cero show ads.
Which is updated more often, Interval Timer or HIIT Interval Timer | Cero?
Interval Timer ships an update every 9 days, and HIIT Interval Timer | Cero every 2 weeks. Most recently, Interval Timer was updated on September 24, 2026 and HIIT Interval Timer | Cero on September 20, 2026.

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