# Fartlek Interval Trainer vs TrainerTherapist

The clearest difference is in-app purchases: TrainerTherapist at none against Fartlek Interval Trainer's 4. TrainerTherapist also leads on iOS requirement (13.0 vs 26.0). Fartlek Interval Trainer's advantage is update cadence (every 9 days vs every 3 months). 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. TrainerTherapist asks for nothing beyond the download.

Fartlek Interval Trainer ships an update every 9 days, TrainerTherapist every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Fartlek Interval Trainer | TrainerTherapist |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 months |
| Monetization | Freemium | — |
| Size | 86 MB | 54 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Richard English](https://appshunter.io/developer/1537547687) | [Omar Ahmadzai](https://appshunter.io/developer/1705184528) |

## 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 |


### TrainerTherapist

[App page](https://appshunter.io/ios/app/trainertherapist-drahmadzai/id6463856542)

**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 TrainerTherapist free?

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

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

Neither Fartlek Interval Trainer nor TrainerTherapist shows ads.

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

Fartlek Interval Trainer ships an update every 9 days, and TrainerTherapist every 3 months. Most recently, Fartlek Interval Trainer was updated on November 3, 2026 and TrainerTherapist on November 3, 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.*