Comparison

Core Advantage Interval Timer vs Fartlek

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

Features
Read full description

Tell your AI coach your goal and the days you can run, and get a training plan that adapts every week to how your runs go. Need a single workout? Describe it or paste a screenshot, and it's ready in seconds. Then just run: voice and haptic cues guide every interval, even with your screen off. 25 workouts runners actually love — HIIT, fartlek, tempo, hills, Yasso 800s. On iPhone and Apple Watch. Because running the same pace every day only makes you better at running the same pace. Break the plateau. EVERY RUN IS A NEW CHALLENGE Every workout here has a specific goal and a different feel — so you actually train different muscles, systems, and skills instead of just logging miles. Your running workout is fun now :) Speed: 200m pops, ladders, strides, sprint finishers Strength: Hill repeats, power builders, switchbacks Stamina: HIIT, Cruise intervals, tempo waves, Yasso 800s Endurance: Progressive aerobic, negative splits, scenic cruises Fun: Fartlek games, stoplight play, music flow runs Each workout has a warm-up, main set, and cooldown — with clear effort guidance through every phase. AI WORKOUT GENERATOR Tell the AI coach what you want — "30 minutes, hill repeats, moderate" or "a fartlek that doesn't bore me" — and get a runnable workout in seconds. Paste a screenshot of a workout you saw online and we'll convert it into intervals. TRAIN BY EFFORT, NOT NUMBERS Every interval shows a target effort (80% for work, 30% for recovery). No heart rate monitor needed. GPS pace lies anyway — effort just works better. AUTO-LAP BY DISTANCE OR TIME Distance intervals auto-complete when you hit 200m, 400m, 800m, or whatever target you set. Time intervals count down with precision. No fumbling with lap buttons mid-stride. AUDIO & HAPTIC CUES Get notified at interval start, halfway, and end. Works with your screen off, works on Apple Watch. Built for running outside, where you can't keep glancing at a screen. APPLE WATCH COMPANION Run straight from your wrist. Leave your phone behind for track sessions — the Watch app handles everything on its own. CLEAN, GET-OUT-OF-THE-WAY DESIGN Big, glove-friendly controls. Dark mode. One-screen run view with your current interval front and center, and what's next right there too. AFTER YOUR RUN Review every completed interval — distance, time, pace. Auto-syncs to Apple Health. WORKOUT TYPES Tempo: Sustained-effort training Intervals: Structured speed work Fartlek: Mixed-pace playful running Hills: Uphill repeat sessions Long Run: Extended endurance efforts 3 DURATION OPTIONS Quick (10–15 min): Short, sharp sessions Standard (20–35 min): Complete workouts Long (40–60+ min): Extended training WHO IT'S FOR - Runners looking to improve their times - Runners who like variety and fun - Amateur athletes who want to gain leg strength and power - Anyone looking to improve overall fitness and health - Anyone looking to lose weight with HIIT (High-Intensity Interval Training) - Anyone who wants to run intervals without 10 minutes of setup - Anyone tired of complex running apps that feel more like Instagram No social feeds. No data mining. Just running. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Core Advantage Interval Timer4 screens
Fartlek4 screens

Verdict

The call

The clearest difference is in-app purchases: Core Advantage Interval Timer at none against Fartlek's 3. Core Advantage Interval Timer also leads on iOS requirement (11.0 vs 18.5). Fartlek's advantage is update cadence (every 4 days vs every 2 months). 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 sells 3 in-app purchases, starting at $1.99 per 7 days. Core Advantage Interval Timer asks for nothing beyond the download.

UpkeepUpdate frequency

Core Advantage Interval Timer ships an update every 2 months, Fartlek every 4 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Core Advantage Interval Timer versus Fartlek: the parameters behind the verdict, then further details
ParameterCore Advantage Interval TimerFartlek
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS11.0 — better18.5
Further details — not scored
Size16 MB29 MB
Age rating4+4+
DeveloperCore Advantage Pty LtdAxis SA

In-app purchases

None

Core Advantage Interval Timer

No in-app purchases

3 purchases

Fartlek

Subscriptions3
  • Weekly Plan$1.997 Days
  • Monthly premium$4.991 Month
  • Yearly Premium3 Days trial$29.991 Year

Questions

Is Core Advantage Interval Timer free?
Core Advantage Interval Timer is free to download, with no in-app purchases.
Is Fartlek free?
Fartlek is free to download, with in-app purchases available.
Do Core Advantage Interval Timer or Fartlek have ads?
Neither Core Advantage Interval Timer nor Fartlek shows ads.
Which is updated more often, Core Advantage Interval Timer or Fartlek?
Core Advantage Interval Timer ships an update every 2 months, and Fartlek every 4 days. Most recently, Core Advantage Interval Timer was updated on November 2, 2026 and Fartlek on October 30, 2026.

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