Comparison

Interval Timer vs Core Progression App

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 app helps you manage workout intervals with customizable work and rest periods. It runs in the background and allows music playback, with options to save settings and share progress. Integrates with Apple Health for heart rate monitoring.

Highlights
  • Customizable sets, intervals, and rest times
  • Runs in background and with screen locked
  • Music playlist integration
  • Save settings as templates
  • Apple Health integration for heart rate
  • Post workouts to social media
Features
Read full description

***Free and reliable. Perfect for use at home, at the track or in the gym. We’re proud to introduce this handy little app that helps you keep track of your work and rest periods during workouts. Whether your into cycling, running, lifting weights, exercise, workout, stretching, boxing, MMA or HIT, this interval timer will prove to be an invaluable asset to you. Running foreground, background or with device locked, this reliable app allows you specify an overall time as well as program High/Low intensity interval and rest time between sets. Produced by Polycents! Key Features: - Customizable sets, high/low intensity interval and rest for your own need - Retina display, iOS4 and multitasking - Continue to run even when screen is locked - Play your song or playlist during your workout - Post your workout to Facebook or Twitter - Save settings as templates Customizable Features: - Number of Sets - Countdown Time - Set Time - Low Interval time - High Interval time - Rest Time - First Interval (low or high) - Sound Volume - Timer Sounds - Auto Lock - Vibrate - Pause during Rest - Playlist - New Each Set APPLE HEALTH: -Interval Timer can use Apple Health to show heart rate in Apple Watch App. # Subscription Details # - Monthly and annual subscriptions are available. - Payment will be charged to your iTunes account at confirmation of purchase. - Your subscription will automatically renew unless auto-renew is disabled at least 24 hours before the end of the current subscription period. - Automatic renewals will be charged at the same price you were originally charged for the subscription. - Subscriptions can be managed by going to Account Settings on the App Store after purchase. Terms of Use: https://www.iubenda.com/terms-and-conditions/18915396 Privacy Policy: https://www.iubenda.com/privacy-policy/18915396

About

Core Progression App

This comprehensive fitness platform helps you track daily activities, monitor body metrics, and access over 2000 exercises with 3D demonstrations. Create custom workouts or use presets to guide your fitness journey, earning badges along the way. Syncs with Apple Health for seamless activity logging.

Highlights
  • Class schedules and opening hours
  • Daily fitness activity tracking
  • Weight and body metric tracking
  • 2000+ exercises with 3D demos
  • Preset and custom workouts
  • Badge earning system
  • Apple Health synchronization
Features
Read full description

PLEASE NOTE: YOU NEED A Core Progression ACCOUNT TO ACCESS THIS APP. IF YOU'RE A MEMBER GET IT FOR FREE AT YOUR GYM! Begin your journey to a healthier lifestyle and let Core Progression help you along the way. Introducing Core Progression, most comprehensive fitness platform with: Check class schedules and opening hours Track your daily fitness activities Track your weight and other body metrics Over 2000+ exercises and activities Clear 3D exercise demonstrations Preset workouts and the option to create your own Over 150 badges to earn Select workouts online and synchronize them with your app to workout at home or in the gym while keeping track of your progress. From strength to weight lifting, this app acts as your own personal trainer guiding and giving you the motivation you need. You can sync this app with Apple Health App. If you enable this connection, any workout in the Health app with automatically be added to your Activity Calendar.

Screenshots

Interval Timer4 screens
Core Progression App4 screens

Verdict

The call

The clearest difference is in-app purchases: Core Progression App at none against Interval Timer's 8. Core Progression App also leads on ads (none vs shown) and rating (4.9 vs 4.5). Interval Timer's advantage is update cadence (every 9 days vs every 3 months) and ratings volume (19K vs 32). On price and iOS requirement 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 6 in-app purchases, starting at $0.99 per month. Core Progression App asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Core Progression App holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Interval Timer has 19K ratings behind it against 32, so its average is the more settled of the two. Written reviews point the same way: 73% of Interval Timer's written reviews are positive against 100% of Core Progression App's.

UpkeepUpdate frequency

Interval Timer ships an update every 9 days, Core Progression App every 3 months. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

Scorecard8 real differences · 2 level
Interval Timer versus Core Progression App: the parameters behind the verdict, then further details
ParameterInterval TimerCore Progression App
PriceFreeFree
Rating4.5 (19K ratings)4.9 (32 ratings) — better
Positive reviews72.9% of reviews100.0% of reviews — better
Number of ratings19K — better32
Update frequencyEvery 9 days — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS13.013.0
Further details — not scored
Size143 MB152 MB
Age rating4+12+
DeveloperNEO PIXEL LABS PTE. LTD.Core Progression LLC

Customer experience

Interval Timer

All ratings19,032 ratings
Positive88.4%
Neutral3.3%
Negative8.3%
Written reviews1,595 reviews
Positive72.9%
Neutral5.8%
Negative21.3%

Core Progression App

All ratings32 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Interval Timer

Reported bugs

3 issues
  • Ads block functionality
  • App freezes or crashes
  • Timer doesn't work in background

Requested features

5 requests
  • Add notes to workouts
  • Provide workout history and analytics
  • Allow syncing with Apple Health
  • Improve Apple Watch integration
  • Add more customization options

Core Progression App

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Interval Timer

Subscriptions6
  • Plus - 1 Month$0.991 Month
  • Premium - 1 Month$1.991 Month
  • Plus - 1 Month$1.991 Month
Show 3 more
  • Premium - 1 Month$2.991 Month
  • Plus - 1 Year2 variants$4.991 Year
  • Premium - 1 Year7 Days trial2 variants$9.991 Year
None

Core Progression App

No in-app purchases

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is Core Progression App free?
Core Progression App is free to download, with no in-app purchases.
Which has better reviews, Interval Timer or Core Progression App?
Core Progression App is rated higher. Interval Timer averages 4.5 out of 5 from 19K ratings, while Core Progression App averages 4.9 from 32 ratings.
Do Interval Timer or Core Progression App have ads?
Interval Timer shows ads; Core Progression App does not.
Which is updated more often, Interval Timer or Core Progression App?
Interval Timer ships an update every 9 days, and Core Progression App every 3 months. Most recently, Interval Timer was updated on October 14, 2026 and Core Progression App on October 1, 2026.

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