# Flat or Sharp vs HD

The clearest difference is in-app purchases: HD at none against Flat or Sharp's 7. HD also leads on update cadence (every 10 months vs every 65 months) and iOS requirement (13.0 vs 17.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Flat or Sharp sells 7 in-app purchases, starting at $2.99 per month. HD asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Flat or Sharp against 5.0 for HD. Both are backed by a comparable volume of ratings — 8 and 3 respectively.

Flat or Sharp ships an update every 65 months, HD every 10 months. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Flat or Sharp | HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (8 ratings)](https://appshunter.io/ios/app/flat-or-sharp/id1522100449/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/hd-300-assistant/id1526764718/reviews) |
| Number of ratings | **8** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 65 months | **Every 10 months** |
| Monetization | Freemium | **Free** |
| Size | 4 MB | 76 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Euphorophonics, LLC](https://appshunter.io/developer/1464810513) | [Yamaha Corporation](https://appshunter.io/developer/353469356) |

## What reviewers say

### Flat or Sharp

[App page](https://appshunter.io/ios/app/flat-or-sharp/id1522100449)

This app helps you improve your musical ear by training you to identify flat or sharp intonation in musical intervals. It offers customizable difficulty levels, various interval types, and detailed progress tracking to guide your learning journey.

**Highlights:** Identify flat/sharp intonation, All musical intervals included, Customizable difficulty levels, Melodic and harmonic intervals, Progress tracking and streaks, Practice suggestions and tips

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flat or Sharp Premium (Monthly) | $2.99 | per month |
| Flat or Sharp Premium (Annual) | $14.99 | per year |
| Both Interval Directions | $0.99 | one-time |
| Remove Banner Ad | $0.99 | one-time |
| All Duration Options | $1.99 | one-time |
| All Accuracy Options | $2.99 | one-time |
| BUNDLE - All Premium Options | $4.99 | one-time |


### 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


## Frequently asked questions

### Is Flat or Sharp free?

Flat or Sharp is free to download, with in-app purchases available.

### Is HD free?

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

### Which has better reviews, Flat or Sharp or HD?

Flat or Sharp and HD are both rated 5.0 out of 5 on the App Store, from 8 and 3 ratings respectively.

### Do Flat or Sharp or HD have ads?

Neither Flat or Sharp nor HD shows ads.

### Which is updated more often, Flat or Sharp or HD?

Flat or Sharp ships an update every 65 months, and HD every 10 months. Most recently, Flat or Sharp was updated on October 2, 2026 and HD on October 6, 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.*