# Fartlek Interval Trainer vs LiftingIrons

The clearest difference is iOS requirement: LiftingIrons at 15.1 against Fartlek Interval Trainer's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Fartlek Interval Trainer sells 4 in-app purchases, starting at $0.99 per month and LiftingIrons sells 1 in-app purchase, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

Fartlek Interval Trainer ships an update weekly, LiftingIrons every 11 days. The most recent releases landed on October 9, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Fartlek Interval Trainer | LiftingIrons |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | Freemium | — |
| Size | 85 MB | 288 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Richard English](https://appshunter.io/developer/1537547687) | [LIFTINGIRONS LTD](https://appshunter.io/developer/1850565025) |

## What reviewers say

### 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 |


### LiftingIrons

[App page](https://appshunter.io/ios/app/liftingirons/id6754858120)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LiftingIrons Subscription | $14.99 | per month |


## Frequently asked questions

### Is Fartlek Interval Trainer free?

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

### Is LiftingIrons free?

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

### Do Fartlek Interval Trainer or LiftingIrons have ads?

Neither Fartlek Interval Trainer nor LiftingIrons shows ads.

### Which is updated more often, Fartlek Interval Trainer or LiftingIrons?

Fartlek Interval Trainer ships an update weekly, and LiftingIrons every 11 days. Most recently, Fartlek Interval Trainer was updated on October 9, 2026 and LiftingIrons on October 18, 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.*