# Core Advantage Interval Timer vs Fartlek Interval Trainer

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.

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.

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.

## The numbers

| Metric | Core Advantage Interval Timer | Fartlek Interval Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/core-advantage-interval-timer/id1326735105/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 16 MB | 85 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Core Advantage Pty Ltd](https://appshunter.io/developer/1326735104) | [Richard English](https://appshunter.io/developer/1537547687) |

## What reviewers say

### Core Advantage Interval Timer

[App page](https://appshunter.io/ios/app/core-advantage-interval-timer/id1326735105)

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:** macOS Compatibility

**In-app purchases:** none


### Fartlek Interval Trainer

[App page](https://appshunter.io/ios/app/fartlek-interval-trainer/id1537547685)

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:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Annual | $6.99 | per year |
| RemoveAds | $0.99 | one-time |
| Lifetime | $14.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*