# Fartlek vs Interval Running

The clearest difference is in-app purchases: Interval Running at none against Fartlek's 3. Interval Running also leads on iOS requirement (16.6 vs 18.5). Fartlek's advantage is update cadence (every 4 days vs every 10 days). On price, ads and device support there is nothing between them.

Both are free to download. Fartlek sells 3 in-app purchases, starting at $1.99 per 7 days. Interval Running asks for nothing beyond the download.

Fartlek ships an update every 4 days, Interval Running every 10 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Fartlek | Interval Running |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/interval-running-run-your-way/id6762284909/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 10 days |
| Monetization | — | Free |
| Size | 29 MB | 52 MB |
| Requires iOS | 18.5 | **16.6** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Axis SA](https://appshunter.io/developer/1621529800) | [RYNYUL](https://appshunter.io/developer/580531175) |

## What reviewers say

### Fartlek

[App page](https://appshunter.io/ios/app/fartlek-interval-run-timer/id6752724674)

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $1.99 | per 7 days |
| Monthly premium | $4.99 | per month |
| Yearly Premium | $29.99 | per year |


### Interval Running

[App page](https://appshunter.io/ios/app/interval-running-run-your-way/id6762284909)

Create personalized running routines that adapt to your daily energy levels. Mix walking, jogging, running, and sprinting with custom intervals and voice coaching. Track progress and set goals without comparison.

**Highlights:** Customizable interval plans, Voice coaching for hands-free use, Goal-based running themes, Detailed phase analysis, Daily, weekly, and monthly reporting, Shareable run cards

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Fartlek free?

Fartlek is free to download, with in-app purchases available.

### Is Interval Running free?

Interval Running is free to download, with no in-app purchases.

### Do Fartlek or Interval Running have ads?

Neither Fartlek nor Interval Running shows ads.

### Which is updated more often, Fartlek or Interval Running?

Fartlek ships an update every 4 days, and Interval Running every 10 days. Most recently, Fartlek was updated on October 26, 2026 and Interval Running on October 28, 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.*