Comparison

Core Advantage Interval Timer vs Fartlek Interval Trainer

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

Head to head
About

Core Advantage Interval Timer

Create and follow custom interval training routines or choose from pre-built workouts. This app supports various training styles, from high-intensity sprints to tempo control and stretching protocols, with adjustable music volume.

Highlights
  • Customizable workout builder
  • Pre-built workout library
  • Adjustable interval volume
  • Training metronome
  • Repeat sprint timer
  • Tempo control timer
Features
Read full description

Welcome to the Core Advantage Interval Timer. Choose from our list of pre-built workouts or build & save your own with custom. Listen to music while you train with adjustable interval volume levels. Workouts include: - 8:12s. The most effective and efficient way to improve anaerobic fitness on a spin bike - Fartlek Timer. Swedish for speed play, use for a randomised workout of hard, moderate and easy effort - Game Fit. The world’s best sports replication drill designed to replicate the movement patterns, muscle groups and fitness demands of team sport - Training Metronome. Use this simple tool to improve your running cadence or lifting tempo. - Repeat Sprints. Long slow cardio is ineffective for power athletes get fit with repeated high-velocity sprints - Stretching. Custom built for the Core Advantage Crouching three stretching protocol - Tempo Timer. Use to accurately control your strength training tempo - Custom. Build and save your own timing protocols with our workout builder. [www.coreadvantage.com.au](http://www.coreadvantage.com.au/) Updates: **Version 2.1.0*** - Introducing a training metronome! This is a key tool that we often use in the gym for improving running and cycling cadence or building rhythm and coordination on movements. Set up a duration for the timer then pick a cadence, you can even adjust the tempo from within the timer. - A little styling change here and there, with some streamlined button sizes and font adjustments - Added titles to the top of each page and shortened up the menu item names for slick-ness ***Version 2.0.1*** Squashed a few little bugs that had snuck into the apps functionality with the last big update. - Thanks to Glenn for this one: Remember me functionality. Hate re-typing your email? Tick the remember me box and suffer no longer as your details will be saved. - A few athletes pointed this one out too: Music & podcasts will now play again while you are training hard, sorry you had to sweat in silence these past few weeks. - Somehow our gym open times had -1 instead of 0 for empty time slots. Not even sure how you do that, but it's fixed now so we will stop the philosophical pondering on negative attendance. - Adjusted interface for Core Advantage members booking class times - buttons now look more button-y and the words are good-er. - Bug work in progress: There may still be some delay between setting up an ongoing bulk enrollment and it becoming visible in your schedule, we did a little work to speed this up, but stay patient with it, as they might not all appear straight away. ***Version 2.0.0*** Core Advantage members can now book and change their training schedule. Simply log in using your account email address and date of birth (DDMMYY format) to view and book times in the gym. *Parents and guardians can also log in using their email address with the date of birth of any of their children/dependents ***New in version 1.2.0*** - Fartlek Timer. Swedish for speed play, use for a randomised workout of hard, moderate and easy effort - Tempo Timer. Use to accurately control your strength training tempo - Independent volume control. So you can keep the music pumping and the bells in the background

About

Fartlek Interval Trainer

This running app automatically detects spontaneous intervals during Fartlek runs, providing live color-coded feedback on your effort. It also functions as a powerful timer for structured workouts like HIIT and Tabata, offering detailed metrics and syncing with Strava and Apple Health.

Highlights
  • Auto-detection of Fartlek intervals
  • Live color-coded effort feedback
  • Structured workout timer (HIIT, Tabata)
  • Detailed interval metrics
  • Strava and Apple Health integration
  • Advanced effort level detection
Features
Read full description

Build the interval workout you want. Stay on target while you train. Then learn from every session. FiT is an interval timer and training companion for runners on Apple Watch and iPhone. Create classic intervals, HIIT and Tabata workouts—or run freely with automatic Fartlek interval detection. CREATE WORKOUTS YOUR WAY Build simple work-and-rest sessions or advanced workouts with warm-ups, cooldowns, repeated sets and multiple effort levels. FiT makes even complex sessions clear and easy to follow. STAY ON TARGET Color-coded feedback shows whether you’re on pace. Spoken coaching, audio and haptic alerts help you respond without constantly checking your device—and spoken cues automatically match your chosen language. The Dual Progress Ring shows both your current interval and your overall workout progress at a glance. FARTLEK WITHOUT THE BUTTONS Switch to Fartlek mode and run by feel. FiT detects changes in your speed and automatically converts them into recorded intervals. No reaching for your device. No tapping between efforts. Just run. LEARN FROM EVERY WORKOUT See how each interval performed with detailed pace, heart rate, cadence and distance metrics. Compare workouts to understand how your performance changes over time. Personalized coaching insights use your workout data to highlight meaningful patterns and offer practical recommendations for future sessions. ADVANCED EFFORT TRACKING Advanced workouts can distinguish between sprint, hard, moderate and easy efforts, helping you create more varied sessions and analyze every effort afterwards. APPLE WATCH, IPHONE AND YOUR FITNESS APPS Train in your chosen language on Apple Watch or iPhone. Create and edit interval workouts directly on your watch, with controls for inserting, reordering and deleting interval groups. Save completed workouts to Apple Health and sync your sessions with Strava. KEY FEATURES • Flexible interval timer for running, HIIT and Tabata • Automatic Fartlek interval detection • Dual-ring live workout progress • Color-coded pace and effort feedback • Localized spoken coaching, plus audio and haptic alerts • Create and edit interval workouts on Apple Watch • Detailed pace, heart rate, cadence and distance metrics • Performance tracking for every interval • Workout comparisons and personalized insights • Sprint, hard, moderate and easy effort levels • Apple Health and Strava integration • Light and dark appearance Run free. Train smart. Learn from every session. SUBSCRIPTION TERMS FiT offers an optional auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription at any time in your Apple ID account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.iubenda.com/privacy-policy/39192677

Screenshots

Core Advantage Interval Timer4 screens
Fartlek Interval Trainer4 screens

Verdict

The call

The clearest difference is in-app purchases: Core Advantage Interval Timer at none against Fartlek Interval Trainer's 4. Core Advantage Interval Timer also leads on iOS requirement (11.0 vs 26.0). Fartlek Interval Trainer's advantage is update cadence (weekly vs every 2 months) and review sentiment (75% vs 50%). On price, ads and device support 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. Fartlek Interval Trainer sells 4 in-app purchases, starting at $0.99 per month. Core Advantage Interval Timer asks for nothing beyond the download.

UpkeepUpdate frequency

Core Advantage Interval Timer ships an update every 2 months, Fartlek Interval Trainer weekly. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

Scorecard5 real differences · 5 level
Core Advantage Interval Timer versus Fartlek Interval Trainer: the parameters behind the verdict, then further details
ParameterCore Advantage Interval TimerFartlek Interval Trainer
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews50.0% of reviews75.0% of reviews — better
Number of ratings4 — better—
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS11.0 — better26.0
Further details — not scored
Size16 MB85 MB
Age rating4+4+
DeveloperCore Advantage Pty LtdRichard English

Customer experience

Core Advantage Interval Timer

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

Fartlek Interval Trainer

Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

Core Advantage Interval Timer

No in-app purchases

4 purchases

Fartlek Interval Trainer

Subscriptions2
  • Monthly$0.991 Month
  • Annual7 Days trial$6.991 Year
One-time2
  • RemoveAds$0.99
  • Lifetime$14.99

Questions

Is Core Advantage Interval Timer free?
Core Advantage Interval Timer is free to download, with no in-app purchases.
Is Fartlek Interval Trainer free?
Fartlek Interval Trainer is free to download, with in-app purchases available.
Do Core Advantage Interval Timer or Fartlek Interval Trainer have ads?
Neither Core Advantage Interval Timer nor Fartlek Interval Trainer shows ads.
Which is updated more often, Core Advantage Interval Timer or Fartlek Interval Trainer?
Core Advantage Interval Timer ships an update every 2 months, and Fartlek Interval Trainer weekly. Most recently, Core Advantage Interval Timer was updated on October 6, 2026 and Fartlek Interval Trainer on October 9, 2026.

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