Comparison

Interval Timer vs Interval Timer for HIIT | 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 provides a customizable timer for high-intensity interval training (HIIT), Tabata, and other workout styles. It offers clear visual cues and sound notifications to guide users through work and rest periods, allowing them to focus on their exercise. Users can save routines, set reminders, and integrate with music playback.

Highlights
  • Customizable work and rest intervals
  • Sound cues for phase transitions
  • Background operation
  • Landscape mode support
  • Save custom routines
  • Workout reminders
  • Clear phase color indicators
Features
Read full description

Set your work and rest intervals, press start, and focus on your workout. PureHIIT is a simple timer for HIIT, Tabata, EMOM, circuits, and boxing rounds. • Adjust work, rest, and round settings to suit your session. • Follow sound cues as you move from one phase to the next. • Keep listening to your music while you train. • Use the timer in the background or in landscape mode. • Start with a prebuilt routine or save your own. • Set workout reminders to help you keep a routine. Getting started is simple: choose a routine or set your intervals, check the number of rounds, and press start. Clear phase colors help you see when to work and when to rest. Free to download, with optional in-app purchases. Apple Watch features require Premium. On Apple Watch, the app integrates with Health to record heart rate and energy used. Make time for your next workout with PureHIIT. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Interval Timer for HIIT | Cero

Create custom interval workouts for HIIT, Tabata, and circuit training. Features adaptive heart rate training, Siri integration, and Apple Watch support. Track progress and share your custom routines.

Highlights
  • Customizable interval programming
  • Adaptive heart rate training
  • Siri and Shortcuts integration
  • Apple Watch app
  • Workout history and sharing
  • Live Activities and Dynamic Island support
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
Interval Timer for HIIT | Cero4 screens

Verdict

The call

The clearest difference is update cadence: Interval Timer for HIIT | Cero at every 3 days against Interval Timer's fortnightly. Interval Timer's advantage is iOS requirement (15.0 vs 18.0). On price, rating, review sentiment and ratings volume 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 7 in-app purchases, starting at $3.99 per month and Interval Timer for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Interval Timer against 4.7 for Interval Timer for HIIT | Cero. Both are backed by a comparable volume of ratings — 297 and 438 respectively. Written reviews are what separate them: 73% of Interval Timer's written reviews are positive against 75% of Interval Timer for HIIT | Cero's.

UpkeepUpdate frequency

Interval Timer ships an update fortnightly, Interval Timer for HIIT | Cero every 3 days. Both last shipped on November 6, 2026.

Scorecard2 real differences · 8 level
Interval Timer versus Interval Timer for HIIT | Cero: the parameters behind the verdict, then further details
ParameterInterval TimerInterval Timer for HIIT | Cero
PriceFreeFree
Rating4.8 (297 ratings) — better4.7 (438 ratings)
Positive reviews73.3% of reviews74.6% of reviews — better
Number of ratings297438 — better
Update frequencyFortnightlyEvery 3 days — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS15.0 — better18.0
Further details — not scored
Size45 MB50 MB
Age rating+44+
DeveloperMiklos PavelFlawless Studio LLC

Customer experience

Interval Timer

All ratings297 ratings
Positive96.0%
Neutral1.7%
Negative2.4%
Written reviews15 reviews
Positive73.3%
Neutral6.7%
Negative20.0%

Interval Timer for HIIT | Cero

All ratings438 ratings
Positive92.9%
Neutral3.9%
Negative3.2%
Written reviews59 reviews
Positive74.6%
Neutral10.2%
Negative15.3%

User reviews

Interval Timer

From 297 App Store ratings

What we love

  • 👍 Easy to use
  • 👍 Great timer functionality
  • 👍 Can program intervals (warmup, activity, rest, cool down)
  • 👍 Supports many rounds (up to 100)
  • 👍 Ability to save workouts

Room to improve

  • 💰 App became paid unexpectedly
  • 💰 Premium required to start timer
  • 💡 Round cap limits functionality for high rep activities
  • 💡 Needs more than 30 intervals for some routines (e.g., stretching)
  • 💡 Lacks a background click feature (e.g., every second)

Interval Timer for HIIT | Cero

From 438 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

2 issues
  • Advertisements still present after paying for removal
  • App requires premium to start timer (recent change)

Requested features

8 requests
  • Remove the cap on rounds
  • Add a background click feature (e.g., every second)
  • More sound options
  • Option for more than one workout
  • Add a halfway beep
Show 3 more
  • Add a countdown for the workout interval
  • Beep once at 15 seconds for a 30-second workout interval
  • Countdown the last 3 seconds of a workout interval

Interval Timer for HIIT | 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

7 purchases

Interval Timer

Subscriptions2
  • Monthly$3.991 Month
  • Yearly7 Days trial$19.991 Year
One-time5
  • Remove Ads$1.99
  • Custom sounds$1.99
  • Premium features$4.99
Show 2 more
  • Premium features$9.99
  • Premium features$14.99
2 purchases

Interval Timer for HIIT | Cero

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

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is Interval Timer for HIIT | Cero free?
Interval Timer for HIIT | Cero is free to download, with in-app purchases available.
Which has better reviews, Interval Timer or Interval Timer for HIIT | Cero?
Interval Timer is rated higher. Interval Timer averages 4.8 out of 5 from 297 ratings, while Interval Timer for HIIT | Cero averages 4.7 from 438 ratings.
Do Interval Timer or Interval Timer for HIIT | Cero have ads?
Both Interval Timer and Interval Timer for HIIT | Cero show ads.
Which is updated more often, Interval Timer or Interval Timer for HIIT | Cero?
Interval Timer ships an update fortnightly, and Interval Timer for HIIT | Cero every 3 days. Most recently, Interval Timer was updated on November 6, 2026 and Interval Timer for HIIT | Cero on November 6, 2026.

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