# Fartlek Interval Trainer vs IronBlueprint

The clearest difference is in-app purchases: IronBlueprint at none against Fartlek Interval Trainer's 4. IronBlueprint also leads on iOS requirement (15.1 vs 26.0). Fartlek Interval Trainer's advantage is update cadence (every 11 days vs monthly). 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. IronBlueprint asks for nothing beyond the download.

Fartlek Interval Trainer ships an update every 11 days, IronBlueprint monthly. The most recent releases landed on November 11, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Fartlek Interval Trainer | IronBlueprint |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Monthly |
| Monetization | Freemium | — |
| Size | 87 MB | 31 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Richard English](https://appshunter.io/developer/1537547687) | [IronBlueprint](https://appshunter.io/developer/1791049385) |

## 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 |


### IronBlueprint

[App page](https://appshunter.io/ios/app/ironblueprint/id6740692558)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fartlek Interval Trainer free?

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

### Is IronBlueprint free?

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

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

Neither Fartlek Interval Trainer nor IronBlueprint shows ads.

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

Fartlek Interval Trainer ships an update every 11 days, and IronBlueprint monthly. Most recently, Fartlek Interval Trainer was updated on November 11, 2026 and IronBlueprint on November 8, 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.*