Comparison

HIIT Interval Timer | Cero vs GymFit

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

GymFit

This app helps experienced gym-goers optimize their workouts by providing customizable interval timers. It allows users to create, save, and edit workout routines, track progress, and manage time efficiently to maximize productivity during gym sessions.

Highlights
  • Create customizable workouts
  • Add unlimited intervals
  • Edit and rearrange intervals
  • Save custom workout routines
  • Integrates with Apple HealthKit
  • Easy-to-use interface
Features
Read full description

Intervals Workout Timer is designed for intelligent, efficient, and hard-working individuals who are seasoned in the gym. We're not here for beginners. The app helps you manage time and follow workout circuits easily. Manage Time Easily - Do you hate it when you plan on going to the gym for a quick 30-45-minute workout and you don't end up leaving for another hour or two? How about when a group is spending their time talking over the bench that YOU'RE waiting on using? No need to waste time or wait anymore! Improve Gym Workouts - Intervals is designed to get you in and out of the gym, while still giving you the workout you intended. You have been to the gym plenty of times and are definitely not a beginner. You know exactly what you want to do at the gym before you show up to workout. But every time you get to your gym, you end up wasting valuable time that you could be spending elsewhere. 
Features of Intervals Workout Timer: CREATE WORKOUTS: - Create workouts that are fully customizable. Save the intervals in your device so you only need to build your workout once! Add as many workouts as you want and set different timers for every workout to manage time and exercise easily. ADD INTERVALS: - Add as many intervals as you want to your workout so that you can maximize the productivity of your workout! No need to stop between exercises to figure out what to do next as this feature will enable you to keep a track of your progress, view remaining time as well as get a clue on what to do next. EDIT WORKOUTS: - Each interval is completely customizable and editable. All you need to do is create a chart and figure out the best workout course. You can create and edit as many workouts as you want.Edit the name, time, and assign a color so that it's easier for you to recognize during training. Eliminate distractions and clutter so you can focus on more important things like finishing your sets CUSTOMIZE YOUR CIRCUIT: - Are you planning on switching to a new workout routine to reach your next fitness goal? How about doing multiple workouts in a single day? By using this app, you can customize your circuits easily. Customize your circuit by editing, rearranging or deleting any interval that seems out of place! EASY TO USE: - The Intervals Workout Timer is very easy to us – all thanks to its simple and easy UI/UX. The app offers clear menus and options to navigate to the right feature and customize it accordingly. Enjoy smooth controls and seamless performance as you create new plans and enjoy your workouts. APPLE HEALTH KIT - Intervals Workout Timer is now integrated with Apple HealthKit. This gives you the ability to receive credit for workouts you complete with Intervals, on your Apple Activity rings. It also gives you the ability to track previous workout sessions so you can more easily monitor your workout progress. Are you ready to maximize the productivity of your workout plans by learning time management? Download and use Intervals Workout Timer today! EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

HIIT Interval Timer | Cero4 screens
GymFit4 screens

Verdict

The call

The clearest difference is update cadence: HIIT Interval Timer | Cero at every 3 days against GymFit's every 11 days. HIIT Interval Timer | Cero also leads on ratings volume (435 vs 17) and review sentiment (75% vs 62%). On price, rating, ads 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 2 in-app purchases, starting at $2.99 per month and GymFit sells 12 in-app purchases, starting at $1.99 per 7 days. 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 4.6 for GymFit. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 17, 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 62% of GymFit's.

UpkeepUpdate frequency

HIIT Interval Timer | Cero ships an update every 3 days, GymFit every 11 days. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

Scorecard3 real differences · 7 level
HIIT Interval Timer | Cero versus GymFit: the parameters behind the verdict, then further details
ParameterHIIT Interval Timer | CeroGymFit
PriceFreeFree
Rating4.7 (435 ratings) — better4.6 (17 ratings)
Positive reviews74.6% of reviews — better61.5% of reviews
Number of ratings435 — better17
Update frequencyEvery 3 days — betterEvery 11 days
AdsYesYes
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 MB55 MB
Age rating4+4+
DeveloperFlawless Studio LLCPoutier Ventures 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%

GymFit

All ratings17 ratings
Positive88.2%
Neutral5.9%
Negative5.9%
Written reviews13 reviews
Positive61.5%
Neutral7.7%
Negative30.8%

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

GymFit

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
12 purchases

GymFit

Subscriptions10
  • Weekly Subscription$1.997 Days
  • Monthly Subscription$4.991 Month
  • Yearly Subscription7 Days trial$19.991 Year
Show 7 more
  • Yearly Subscription3 Days trial$19.991 Year
  • Yearly Subscription3 Days trial$29.991 Year
  • Yearly Subscription7 Days trial$29.991 Year
  • Yearly Subscription$29.991 Year
  • 3 Day Trial Then Yearly Trial3 Days trial$39.991 Year
  • Week Trial Yearly Subscription7 Days trial$39.991 Year
  • Yearly Subscription$49.991 Year
One-time2
  • Remove All Ads$1.99
  • Ad & Workout Generator Bundle$2.99

Questions

Is HIIT Interval Timer | Cero free?
HIIT Interval Timer | Cero is free to download, with in-app purchases available.
Is GymFit free?
GymFit is free to download, with in-app purchases available.
Which has better reviews, HIIT Interval Timer | Cero or GymFit?
HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while GymFit averages 4.6 from 17 ratings.
Do HIIT Interval Timer | Cero or GymFit have ads?
Both HIIT Interval Timer | Cero and GymFit show ads.
Which is updated more often, HIIT Interval Timer | Cero or GymFit?
HIIT Interval Timer | Cero ships an update every 3 days, and GymFit every 11 days. Most recently, HIIT Interval Timer | Cero was updated on October 16, 2026 and GymFit on October 17, 2026.

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