Comparison

Interval Timer for HIIT | Cero vs Intervals

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
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/

About

Intervals

This app provides a customizable timer for high-intensity interval training, Tabata, and circuit workouts. It offers voice guidance, workout history tracking, and multiple sound alerts to enhance your fitness routine. Designed for all fitness levels and workout styles, it helps you stay focused and achieve your goals.

Highlights
  • Customizable workout and rest intervals
  • Workout history and calendar view
  • Voice guidance for workouts
  • Multiple sound alerts
  • Simple and intuitive interface
  • Supports various workout styles
Features
Read full description

Interval Timer · Tabata & HIIT - Your Ultimate Workout Companion Take control of your high-intensity training with Interval Timer · Tabata & HIIT, the most versatile and user-friendly timer app designed for HIIT, Tabata, circuit training, and more. Whether you're a fitness beginner or a seasoned athlete, this app is your go-to tool for efficient, effective, and engaging workouts. Key Features: - Customizable Intervals – Easily set up workout and rest times, rounds, and cycles to match your training style. Perfect for HIIT, Tabata, and other interval-based workouts. - Workout History & Calendar View – Save your workout records and track progress over time. Check your completed sessions in the calendar page for easy review. - Voice Guidance – Stay focused with clear voice prompts that guide you through each phase of your workout—no need to check your screen! - Multiple Sound Alerts – Choose from a variety of sounds to signal the start and end of intervals, keeping your sessions dynamic and motivating. - Simple & Intuitive Design – A clean, easy-to-use interface lets you set up and start your workouts in seconds. Why Choose Interval Timer · Tabata & HIIT? - For Everyone – Whether you're doing bodyweight exercises, weightlifting, cardio, or yoga, this app fits all workout styles. - Track Your Progress – Save workout logs and review past sessions in the calendar view to stay motivated and monitor improvements. - No Distractions – Focus on your training with a minimalist design and no unnecessary clutter. - Work Anywhere – Perfect for home workouts, gym sessions, or outdoor training. Download Now and Transform Your Workouts! Ready to take your fitness to the next level? Interval Timer · Tabata & HIIT helps you stay on track, push your limits, and achieve your goals—with smart tracking and progress insights. Get started today and make every second of your workout count! Privacy Policy https://mozisoftware.blogspot.com/2025/02/privacy-policy-interval-timer.html Terms of Use: https://mozisoftware.blogspot.com/2025/02/terms-of-use-interval-timer_25.html

Screenshots

Interval Timer for HIIT | Cero4 screens
Intervals4 screens

Verdict

The call

The clearest difference is rating: Interval Timer for HIIT | Cero at 4.7 against Intervals's 4.3. Interval Timer for HIIT | Cero also leads on update cadence (every 3 days vs every 3 weeks) and ratings volume (436 vs 9). On price, ads, in-app purchases and monetization model 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 for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month and Intervals sells 4 in-app purchases, starting at $0.99 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 4.3. That said, the two scores are not equally well evidenced: Interval Timer for HIIT | Cero has 436 ratings behind it against 9, so its average is the more settled of the two.

UpkeepUpdate frequency

Interval Timer for HIIT | Cero ships an update every 3 days, Intervals every 3 weeks. The most recent releases landed on October 20, 2026 and September 17, 2026 respectively.

Scorecard3 real differences · 7 level
Interval Timer for HIIT | Cero versus Intervals: the parameters behind the verdict, then further details
ParameterInterval Timer for HIIT | CeroIntervals
PriceFreeFree
Rating4.7 (436 ratings) — better4.3 (9 ratings)
Positive reviews74.6% of reviews—
Number of ratings436 — better9
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Apple Watch — better
Requires iOS16.015.0 — better
Further details — not scored
Size42 MB20 MB
Age rating4+4+
DeveloperFlawless Studio LLCMozi SW Info

Customer experience

Interval Timer for HIIT | Cero

All ratings436 ratings
Positive92.9%
Neutral3.9%
Negative3.2%
Written reviews59 reviews
Positive74.6%
Neutral10.2%
Negative15.3%

Intervals

All ratings9 ratings
Positive77.8%
Neutral11.1%
Negative11.1%

Bugs and 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

Intervals

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Interval Timer for HIIT | Cero

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

Intervals

Subscriptions2
  • Monthly$0.991 Month
  • Yearly3 Days trial$5.991 Year
One-time2
  • Lifetime limited time offer$9.99
  • Lifetime Subscription$12.99

Questions

Is Interval Timer for HIIT | Cero free?
Interval Timer for HIIT | Cero is free to download, with in-app purchases available.
Is Intervals free?
Intervals is free to download, with in-app purchases available.
Which has better reviews, Interval Timer for HIIT | Cero or Intervals?
Interval Timer for HIIT | Cero is rated higher. Interval Timer for HIIT | Cero averages 4.7 out of 5 from 436 ratings, while Intervals averages 4.3 from 9 ratings.
Do Interval Timer for HIIT | Cero or Intervals have ads?
Both Interval Timer for HIIT | Cero and Intervals show ads.
Which is updated more often, Interval Timer for HIIT | Cero or Intervals?
Interval Timer for HIIT | Cero ships an update every 3 days, and Intervals every 3 weeks. Most recently, Interval Timer for HIIT | Cero was updated on October 20, 2026 and Intervals on September 17, 2026.

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