Comparison

Intervals Pro vs Group Fitness Class Timer

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

Head to head
About

Intervals Pro

Create and follow custom interval training routines for various fitness activities. This app offers extensive customization for intervals, alerts, and goals, with seamless integration for Apple Watch and Apple Health.

Highlights
  • Highly customizable intervals (time/distance)
  • Spoken interval names and prompts
  • Standalone Apple Watch workouts
  • Workout history with Apple Health
  • Home screen widgets for quick launch
  • Bluetooth heart rate monitor support
  • Siri Shortcuts integration
Features
Read full description

Custom Interval Training at its best for iPhone, Apple Watch and iPad. Featured by Apple and recommended by fitness instructors, personal trainers, marathon runners, and coaches. Let Intervals Pro guide you through any type of interval workout: HIIT, running, strength training, yoga, stretching, circuit training, boxing, MMA, elliptical, rehabilitation, meditation, 7-minute workouts, and many more. FEATURED BY • Apple - App of the Day in 132 Countries • Apple - Workout with Apple Watch, Quick HIIT Workouts • Women's Health Magazine • COACH Magazine • SixColors.com HIGHLIGHTS • Highly Customizable • Home Screen Widgets to quickly launch timers • Spoken interval names and prompts • Customizable alert sounds • Standalone Apple Watch workouts. Leave your iPhone at home! • Workout History using Apple Health data • View an Apple Watch workout live on your iPhone! • Run in the background with the screen locked • Play music or podcasts using the app of your choice • Bluetooth heart rate monitor support for Apple Watch or iPhone • Fill your Activity Rings • Siri Shortcuts • Share timers with friends • Time and Distance Goals • Running Pace and Heart Rate Targets • Auto pause and resume • Send completed workouts to Strava • Confetti! PERSONALIZE YOUR WORKOUT • Customize the Name, Duration, Alert, and Color for each interval • Customize Alert Sounds and Voice Prompts to guide you through your workout • Set a Countdown Alert and vibrations when the interval is about to end • Optional halfway alert • Set target heart rate ranges for each interval • Set time and distance goals FLEXIBLE INTERVAL DURATIONS • Time based (e.g., 45 seconds) • Distance-based (e.g., 0.5 MI or KM) • Count up intervals keep running until your ready for the next interval • Estimated time or distance. Count down time or distance to zero and then continue the interval, counting up until you're ready to move on. THE BEST APPLE WATCH INTERVAL TIMER • Leave your phone at home with our standalone Apple Watch app • Control your music or podcasts on the "Now Playing" screen • View an Apple Watch workout live on your iPhone • Alert Sounds and Voice Prompts to guide you through your workout • Configurable haptic alert countdown that taps you on the wrist when the interval is ending • Track heart rate, calories, distance, and pace • Route tracking for running, walking, and cycling • Workouts contribute to the Apple Watch Activity Rings WORKOUT HISTORY USING APPLE HEALTH • Intervals Pro has the best Apple Health integration of any interval training app • Track heart rate, calories, distance, and pace • Route tracking for running, walking, and cycling • Detailed stats for every interval • All your data is safely stored in Apple Health GREAT FOR RUNNING AND CYCLING • Interval duration can be set to either a specified time or distance • Display current pace, pace for the interval, or pace for the entire run • Configure heart rate ranges per interval • Analyze each interval of your run in the workout history MULTIPLE VOICES AND LANGUAGES • Select the language and voice to use for all spoken alerts. • Spoken alerts are localized to 10 languages. Chinese (simplified), Danish, Dutch, French, German, Italian, Norwegian, Polish, Spanish, and Swedish. Get Intervals Pro today, and your workouts will never be the same! SUBSCRIPTION INFO Intervals Pro is free to download and has a free timer. To create multiple timers and unlock all the features of the app, you may choose between a monthly or yearly auto-renewing subscription option. Upon confirmation of the purchase, payment will be charged to your credit card through your iTunes account. Subscription renews automatically unless canceled at least 24 hours before the end of the subscription period. Subscriptions can be managed and auto-renewal turned off in Account Settings in the App Store app. Privacy Policy and Terms of Service: https://intervalspro.com/privacy-policy.html

About

Group Fitness Class Timer

This app helps group fitness instructors plan and lead classes. It combines class structuring, an interval timer, and an exercise library into one tool. Instructors can create custom routines, track time, and even integrate music.

Highlights
  • Class planning and structuring
  • Interval timer with auto-advance
  • Library of 800+ exercises
  • Music integration
  • Apple Watch companion app
  • Custom exercise creation
Features
Read full description

More than a timer. Group Fit Studio is the all-in-one class planner and interval timer built for group fitness instructors. Design how your class flows, fill it with movements from our curated library of 900+ exercises, then press play to teach with your plan and timer working together. Whether you teach HIIT, Tabata, circuits, bootcamp, strength, yoga, Pilates, or barre, Group Fit Studio adapts to your format. Most instructors juggle three tools: notes or a spreadsheet to plan, a separate interval timer to run the clock, and music on the side. Group Fit Studio is all three. The class you build is exactly what the timer runs. No writing on the mirrors, no glancing between apps mid-class. GET STARTED IN MINUTES New to Group Fit Studio? Pick a ready-made starter class and it's yours to customize. Fill in your own exercises, then rehearse it as a live session with a quick guided walkthrough before you teach it for real. Prefer a blank page? Skip straight to building your own class instead. ONE CLASS, ONE PLACE Every class you teach lives on the Classes home. Open one and you get its whole workspace: class setup for the structure with timed blocks, group intervals, and station rotations, plus optional warm-up and cool-down. Set the structure once and prepare it again week after week with fresh movements. Add exercises from a curated library of over 900, organized by muscle group and equipment. Set timing per interval and add instructor notes for cues and transitions. All you have to do is add your exercises and press play. PRESS PLAY Tap Start on any class to run it as your real-time guide. A countdown timer tracks each work and rest interval, auto-advances through your class, and lets you skip forward or back on the fly. Pair an Apple Music playlist with any class so your music starts when class starts and ducks during the countdown beeps. No more losing your place mid-class. WEAR IT ON YOUR WRIST The Apple Watch companion mirrors your live session with the current move, what's next, and the timer at a glance. Use the app controls to pause, resume, skip, or end without picking up your phone. Heart rate and active energy are recorded as a workout in the Health app. BUILD YOUR LIBRARY Browse 900+ exercises, each with step-by-step instructions, primary and secondary muscle targeting, and suggested similar moves to keep your classes fresh. Create your own exercises and use them right away. Submit them to the shared catalog and they may be made available to all instructors after review. MIX & MATCH WITH COMBOS Studio Combos - Browse existing combos or create your own combination of exercises that drop right into an exercise slot in your class. Combos are created by the Group Fit Studio community. Search and filter by muscle group and equipment to find the perfect combo easily. BUILT FOR INSTRUCTORS - Ready-made starter classes to get you teaching in minutes - One workspace per class — structure and this week's exercises side by side - Studio Combos — pre-built or custom exercise groups for any slot - Timed, group, and station-based blocks — HIIT, Tabata, circuits, rounds, and more - Timed blocks with a sequence of moves — each gets its share of the clock, and the live timer calls out what's next - Live session timer with work/rest countdowns, auto-advance, and interval navigation - Apple Watch companion with on-wrist session controls - Apple Music playlist pairing with auto-ducking countdown beeps - Exercise library with 900+ movements and muscle/equipment filters - Create your own exercises and use them immediately in your classes - Offline support — your classes and sessions work without a connection - Session history to track what you taught and when Designed by a group fitness instructor with 19 years of teaching. Group Fit Studio is free to try. A subscription unlocks unlimited classes. --- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Intervals Pro4 screens
Group Fitness Class Timer4 screens

Verdict

The call

The clearest difference is ratings volume: Intervals Pro at 14K against Group Fitness Class Timer's 1. Intervals Pro also leads on iOS requirement (17.5 vs 26.0). Group Fitness Class Timer's advantage is update cadence (every 2 days vs every 8 days) and rating (5.0 vs 4.8). 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. Intervals Pro sells 8 in-app purchases, starting at $2.99 per month and Group Fitness Class Timer sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Group Fitness Class Timer holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Intervals Pro has 14K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Intervals Pro ships an update every 8 days, Group Fitness Class Timer every 2 days. The most recent releases landed on October 18, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 6 level
Intervals Pro versus Group Fitness Class Timer: the parameters behind the verdict, then further details
ParameterIntervals ProGroup Fitness Class Timer
PriceFreeFree
Rating4.8 (14K ratings)5.0 (1 ratings) — better
Positive reviews84.3% of reviews—
Number of ratings14K — better1
Update frequencyEvery 8 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Apple Watch
Requires iOS17.5 — better26.0
Further details — not scored
Size69 MB30 MB
Age rating4+4+
DeveloperIntervals, LLCPaul Krause

Customer experience

Intervals Pro

All ratings13,612 ratings
Positive95.1%
Neutral1.7%
Negative3.2%
Written reviews1,085 reviews
Positive84.3%
Neutral4.9%
Negative10.8%

Group Fitness Class Timer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Intervals Pro

Reported bugs

2 issues
  • Workout data not syncing correctly
  • App crashes or freezes on certain devices

Requested features

3 requests
  • More customization options for interval displays
  • Ability to batch delete or manage workout history
  • Integration with more third-party fitness apps

Group Fitness Class Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Intervals Pro

Subscriptions2
  • Monthly Membership7 Days trial$2.991 Month
  • Yearly Membership7 Days trial$19.991 Year
One-time6
  • Generous Tip$0.99
  • Awesome Tip$1.99
  • Massive Tip$4.99
Show 3 more
  • Amazing Tip$9.99
  • Intervals Pro (Legacy)$69.99
  • Lifetime Access$69.99
2 purchases

Group Fitness Class Timer

Subscriptions2
  • Group Fit Studio Monthly$4.991 Month
  • Group Fit Studio Yearly$29.991 Year

Questions

Is Intervals Pro free?
Intervals Pro is free to download, with in-app purchases available.
Is Group Fitness Class Timer free?
Group Fitness Class Timer is free to download, with in-app purchases available.
Which has better reviews, Intervals Pro or Group Fitness Class Timer?
Group Fitness Class Timer is rated higher. Intervals Pro averages 4.8 out of 5 from 14K ratings, while Group Fitness Class Timer averages 5.0 from 1 ratings.
Do Intervals Pro or Group Fitness Class Timer have ads?
Neither Intervals Pro nor Group Fitness Class Timer shows ads.
Which is updated more often, Intervals Pro or Group Fitness Class Timer?
Intervals Pro ships an update every 8 days, and Group Fitness Class Timer every 2 days. Most recently, Intervals Pro was updated on October 18, 2026 and Group Fitness Class Timer on October 5, 2026.

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