# Guitar Permutation Trainer vs Hark

The clearest difference is price: Hark at Free against Guitar Permutation Trainer's $1.99. Guitar Permutation Trainer's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Hark is free to download; Guitar Permutation Trainer costs $1.99 up front. Hark sells 1 one-off in-app purchase. Guitar Permutation Trainer asks for nothing beyond the download.

Guitar Permutation Trainer ships an update every 3 days, Hark every 4 days. The most recent releases landed on October 10, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Guitar Permutation Trainer | Hark |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hark-ear-training/id6809023239/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | — | Freemium |
| Size | 3 MB | 11 MB |
| Requires iOS | 18.4 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Chouinard](https://appshunter.io/developer/1826188450) | [Ilia Usatov](https://appshunter.io/developer/1868442271) |

## What reviewers say

### Guitar Permutation Trainer

[App page](https://appshunter.io/ios/app/guitar-permutation-trainer/id6748545844)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hark

[App page](https://appshunter.io/ios/app/hark-ear-training/id6809023239)

This app trains musicians to identify notes within a musical key, focusing on their relationship to the tonic. It offers various training modes, including single notes, melodies, and chord progressions, with hands-free operation for convenient practice.

**Highlights:** Identify notes as scale degrees, Hands-free training mode, Multiple training modes (degrees, melodies, chords, progressions), Visual staff with colored notes, Explore any note in any key, Multiple instrument sounds

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hark Pro | $19.99 | one-time |


## Frequently asked questions

### Is Guitar Permutation Trainer free?

Guitar Permutation Trainer costs $1.99, with no in-app purchases.

### Is Hark free?

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

### Do Guitar Permutation Trainer or Hark have ads?

Neither Guitar Permutation Trainer nor Hark shows ads.

### Which is updated more often, Guitar Permutation Trainer or Hark?

Guitar Permutation Trainer ships an update every 3 days, and Hark every 4 days. Most recently, Guitar Permutation Trainer was updated on October 10, 2026 and Hark on October 11, 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.*