# Fartlek vs OnTrack Interval Timer

The clearest difference is iOS requirement: OnTrack Interval Timer at 16.2 against Fartlek's 18.5. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Fartlek sells 2 in-app purchases, starting at $4.99 per month and OnTrack Interval Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Fartlek | OnTrack Interval Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Size | 29 MB | 2 MB |
| Requires iOS | 18.5 | **16.2** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Axis SA](https://appshunter.io/developer/1621529800) | [Jekal Ik](https://appshunter.io/developer/1860824839) |

## What reviewers say

### Fartlek

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

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly plan | $4.99 | per month |
| Yearly Premium | $29.99 | per year |


### OnTrack Interval Timer

[App page](https://appshunter.io/ios/app/ontrack-interval-timer/id6757700812)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Background Mode | $2.99 | one-time |


## Frequently asked questions

### Is Fartlek free?

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

### Is OnTrack Interval Timer free?

OnTrack Interval Timer is free to download, with in-app purchases available.

### Do Fartlek or OnTrack Interval Timer have ads?

Neither Fartlek nor OnTrack Interval Timer shows ads.

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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.*