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 advanced workout timer app features a clear, customizable layout perfect for timing various training styles like Tabata, HIIT, and Circuit Training. It offers text-to-speech interval announcements and background operation, ensuring seamless use during workouts.

Highlights
  • Tabata, HIIT, Circuit & Compound timer types
  • Text to speech interval announcements
  • Customizable colors
  • Background operation
  • Lockable display
  • Vibrations
Features
Read full description

You have found it. The most advanced workout timer app available is now before you. A clear easy to read layout with hundreds of possible setting combinations make this the perfect app to time your workout. Whether you are doing Tabata, HIIT, or Circuit Training this app has you covered. Features: - Tabata, HIIT, Circuit & Compound timer types - Text to speech interval/exercise announcements - Customizable colors - Works well while music is playing from the same device - Runs in the background or when screen is locked - Lockable display - Vibrations Run the app in the foreground, background or with device locked. Text to speech interval announcements will tell you exactly what you need to do. Now go get to work!

About

Interval Timer for HIIT | 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
Interval Timer for HIIT | Cero4 screens

Verdict

The call

The clearest difference is rating: Interval Timer for HIIT | Cero at 4.7 against Interval Timer's 3.9. Interval Timer for HIIT | Cero also leads on review sentiment (75% vs 33%) and ratings volume (438 vs 7). Interval Timer's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, in-app purchases 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. Interval Timer sells 1 one-off in-app purchase 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

Interval Timer for HIIT | Cero holds the better App Store score, 4.7 against 3.9. That said, the two scores are not equally well evidenced: Interval Timer for HIIT | Cero has 438 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 33% of Interval Timer's written reviews are positive against 75% of Interval Timer for HIIT | Cero's.

UpkeepUpdate frequency

Interval Timer ships an update weekly, Interval Timer for HIIT | Cero every 3 days. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

Scorecard7 real differences · 3 level
Interval Timer versus Interval Timer for HIIT | Cero: the parameters behind the verdict, then further details
ParameterInterval TimerInterval Timer for HIIT | Cero
PriceFreeFree
Rating3.9 (7 ratings)4.7 (438 ratings) — better
Positive reviews33.3% of reviews74.6% of reviews — better
Number of ratings7438 — better
Update frequencyWeeklyEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS9.0 — better16.0
Further details — not scored
Size19 MB45 MB
Age rating4+4+
DeveloperCharles VanderhoffFlawless Studio LLC

Customer experience

Interval Timer

All ratings7 ratings
Positive71.4%
Neutral14.3%
Negative14.3%
Written reviews9 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Interval Timer for HIIT | Cero

All ratings437 ratings
Positive92.9%
Neutral3.9%
Negative3.2%
Written reviews59 reviews
Positive74.6%
Neutral10.2%
Negative15.3%

Bugs and requests

Interval Timer

Not enough reviews yet to summarise bugs or requests.

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

1 purchases

Interval Timer

One-time1
  • Timer Pro$4.99
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 for HIIT | Cero is rated higher. Interval Timer averages 3.9 out of 5 from 7 ratings, while Interval Timer for HIIT | Cero averages 4.7 from 438 ratings.
Do Interval Timer or Interval Timer for HIIT | Cero have ads?
Interval Timer for HIIT | Cero shows ads; Interval Timer does not.
Which is updated more often, Interval Timer or Interval Timer for HIIT | Cero?
Interval Timer ships an update weekly, and Interval Timer for HIIT | Cero every 3 days. Most recently, Interval Timer was updated on November 3, 2026 and Interval Timer for HIIT | Cero on November 2, 2026.

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