Comparison

HIIT Interval Timer | Cero vs Interval Timer

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

Interval Timer

This app provides a customizable round-based timer for various time-based activities, including HIIT, circuit training, and boxing. It features a minimalistic design with big digits and bright colors, offering hand-crafted sounds to maintain focus. Users can create complex workouts, save custom sets, and track their workout history with Apple Health integration.

Highlights
  • Customizable round-based timer
  • Minimalistic design with big digits
  • Hand-crafted sounds for focus
  • Unlimited saved intervals
  • Quick Set feature
  • Apple Health integration
  • Dark Mode support
Features
Read full description

The Interval Timer App is a minimalistic, advanced all-in-one round-based timer for iOS Devices (iPhone / iPad). Create complex workouts or sets and get them visualized simple and minimalistic with big digits, bright colors and hand-crafted sounds to support you keeping the focus. Works for all simple and complex time-based activities - use it for your exercise, hiit, tabata, wod, yoga, running, lifting weights, gym workout, cycling, boxing, stretching or even cooking! Create your own set-library with unlimited saved intervals or just hop into a quick one with the "Quick Set" feature! - Pick from a variety of sounds for different phases and cycles - Separate Sound-Volume Setting - Does not interrupt background music - Phone won't lock automatically during sets - Supports Dark Mode - Battery friendly - Customizable color representation for every set - Save your workout-history with apple health! Create simple second-short or complex hour-long intervals with custom set and cycle durations including custom break- and warmup-lengths, round-counts, sounds and colors. ______________________________________________ APP USAGE INFO & SUBSCRIPTION DETAILS Should you choose to upgrade to a subscription, payment will be charged to your iTunes account at confirmation of purchase. Your subscription renews automatically unless cancelled at least 24 hours prior to the end of the current period, and cancellation of the current active subscription period is not allowed. Auto-renewal may be turned off in your Account Settings in iTunes after purchase. You can also manage your subscriptions in Account Settings after purchase. LICENSED APPLICATION END USER LICENSE AGREEMENT: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Service: https://learned-romano-d09.notion.site/Terms-Conditions-4521f83f95f44900931f5887f08b852f Privacy Policy: https://learned-romano-d09.notion.site/Privacy-Policy-3920b87376da4552be9dbc3f0d0d24bf

Screenshots

HIIT Interval Timer | Cero4 screens
Interval Timer4 screens

Verdict

The call

The clearest difference is ads: Interval Timer at none against HIIT Interval Timer | Cero's shown. Interval Timer also leads on review sentiment (91% vs 75%). HIIT Interval Timer | Cero's advantage is ratings volume (435 vs 77). On price, rating, update cadence and in-app purchases 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 1 one-off in-app purchase and Interval Timer sells 2 in-app purchases, starting at $1.99 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 — 4.7 for HIIT Interval Timer | Cero against 4.8 for Interval Timer. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 77, so its average is the more settled of the two. Written reviews are what separate them: 75% of HIIT Interval Timer | Cero's written reviews are positive against 91% of Interval Timer's.

UpkeepUpdate frequency

HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer every 2 days. Both last shipped on September 29, 2026.

Scorecard3 real differences · 7 level
HIIT Interval Timer | Cero versus Interval Timer: the parameters behind the verdict, then further details
ParameterHIIT Interval Timer | CeroInterval Timer
PriceFreeFree
Rating4.7 (435 ratings)4.8 (77 ratings) — better
Positive reviews74.6% of reviews91.2% of reviews — better
Number of ratings435 — better77
Update frequencyEvery 3 daysEvery 2 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size42 MB19 MB
Age rating4+4+
DeveloperFlawless Studio LLCMizo LLC

Customer experience

HIIT Interval Timer | Cero

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

Interval Timer

All ratings77 ratings
Positive97.4%
Neutral1.3%
Negative1.3%
Written reviews34 reviews
Positive91.2%
Neutral2.9%
Negative5.9%

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

Interval Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

HIIT Interval Timer | Cero

One-time1
  • Cero Pro$3.99
2 purchases

Interval Timer

Subscriptions1
  • Intervals+ Monthly$1.991 Month
One-time1
  • Intervals+ Lifetime$9.99

Questions

Is HIIT Interval Timer | Cero free?
HIIT Interval Timer | Cero is free to download, with in-app purchases available.
Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Which has better reviews, HIIT Interval Timer | Cero or Interval Timer?
Interval Timer is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Interval Timer averages 4.8 from 77 ratings.
Do HIIT Interval Timer | Cero or Interval Timer have ads?
HIIT Interval Timer | Cero shows ads; Interval Timer does not.
Which is updated more often, HIIT Interval Timer | Cero or Interval Timer?
HIIT Interval Timer | Cero ships an update every 3 days, and Interval Timer every 2 days. Most recently, HIIT Interval Timer | Cero was updated on September 29, 2026 and Interval Timer on September 29, 2026.

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