# Model D6 vs Scale Study

The clearest difference is price: Scale Study at Free against Model D6's $19.99. Scale Study also leads on update cadence (every 2 weeks vs every 9 months). Model D6's advantage is in-app purchases (none vs 2) and ratings volume (5 vs 1). On rating, ads and device support there is nothing between them.

Scale Study is free to download; Model D6 costs $19.99 up front. Scale Study sells 2 in-app purchases, starting at $0.99 per year. Model D6 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Model D6 against 5.0 for Scale Study. That said, the two scores are not equally well evidenced: Model D6 has 5 ratings behind it against 1, so its average is the more settled of the two.

Model D6 ships an update every 9 months, Scale Study every 2 weeks. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Model D6 | Scale Study |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/model-d6/id6443897794/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/scale-study-tempo-practice/id6758663846/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 13 MB | 20 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Genuine Soundware](https://appshunter.io/developer/1560880481) | [Diem Limited](https://appshunter.io/developer/1439019995) |

## What reviewers say

### Model D6

[App page](https://appshunter.io/ios/app/model-d6/id6443897794)

This app is a physical modeling emulation of the classic Hohner Clavinet D6 keyboard. It recreates the iconic funky sounds used in 70s music and offers extensive sound shaping capabilities with built-in effects and amp simulations.

**Highlights:** Physical Modeling engine, Authentic D6 filter recreation, Adjustable pickup positions, Built-in Wah-Wah, Phaser, Delay, and Reverb effects, Amplifier simulator with 5 models, Responds to pitch bender and aftertouch

**Features:** Vision Pro support

**In-app purchases:** none


### Scale Study

[App page](https://appshunter.io/ios/app/scale-study-tempo-practice/id6758663846)

Improve your piano scale technique by practicing tempo and accuracy. Connect a MIDI keyboard to log your fastest clean tempos and track progress over time. A tapping mode is available for rhythm practice without a keyboard.

**Highlights:** Practice scales with MIDI keyboard, Log fastest accurate tempos, Track progress over time, Focus on speed and accuracy, Rhythm and timing tapping mode

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scale Study Annual Subscription | $0.99 | per year |
| Scale Study Lifetime Purchase | $2.99 | one-time |


## Frequently asked questions

### Is Model D6 free?

Model D6 costs $19.99, with no in-app purchases.

### Is Scale Study free?

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

### Which has better reviews, Model D6 or Scale Study?

Model D6 and Scale Study are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do Model D6 or Scale Study have ads?

Neither Model D6 nor Scale Study shows ads.

### Which is updated more often, Model D6 or Scale Study?

Model D6 ships an update every 9 months, and Scale Study every 2 weeks. Most recently, Model D6 was updated on November 11, 2026 and Scale Study on October 31, 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.*