# HD vs Harmony Keyboard

The clearest difference is in-app purchases: HD at none against Harmony Keyboard's 1. HD also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Harmony Keyboard's advantage is update cadence (every 5 weeks vs every 10 months). On price and device support there is nothing between them.

Both are free to download. Harmony Keyboard sells 1 in-app purchase, starting at $0.49 per month. HD asks for nothing beyond the download.

HD ships an update every 10 months, Harmony Keyboard every 5 weeks. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | HD | Harmony Keyboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hd-300-assistant/id1526764718/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 76 MB | 45 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yamaha Corporation](https://appshunter.io/developer/353469356) | [SINCLAIR SYSTEM](https://appshunter.io/developer/1794147761) |

## What reviewers say

### HD

[App page](https://appshunter.io/ios/app/hd-300-assistant/id1526764718)

This application connects to a specific device via Bluetooth to remotely control musical functions. It allows instructors to guide students with features like metronome operation, tempo setting, and pitch adjustment. It also includes tools for chord detection and tuning.

**Highlights:** Remote HD control (keyboard, metronome, temperament, transposition), Customizable beat and tempo settings, Individual volume and pitch adjustment, Demonstrate mode for pitch and volume feedback, Chord detection and naming, Adjustable tuner, Rhythm assistant

**Features:** Vision Pro support

**In-app purchases:** none


### Harmony Keyboard

[App page](https://appshunter.io/ios/app/harmony-keyboard/id6745786039)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $0.49 | per month |


## Frequently asked questions

### Is HD free?

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

### Is Harmony Keyboard free?

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

### Do HD or Harmony Keyboard have ads?

Harmony Keyboard shows ads; HD does not.

### Which is updated more often, HD or Harmony Keyboard?

HD ships an update every 10 months, and Harmony Keyboard every 5 weeks. Most recently, HD was updated on October 22, 2026 and Harmony Keyboard on October 24, 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.*