Flat or Sharp vs HD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flat or Sharp
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.
- Identify flat/sharp intonation
- All musical intervals included
- Customizable difficulty levels
- Melodic and harmonic intervals
- Progress tracking and streaks
- Practice suggestions and tips
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Learn how to hear whether musical intervals are flat or sharp by playing a fun quiz-style game! Flat or Sharp includes all musical intervals from a minor 2nd all the way up to two octaves, in melodic or harmonic varieties. Difficulty levels are fully customizable with a variety of options to accommodate any level of musicianship, from beginner to seasoned pro. - Progressively hone your ear by setting desired tuning accuracy from +/- 50 cents all the way down to +/- 5 cents. - Play notes for as long as 4 seconds or as little as 0.2 seconds to work on how quickly you can recognize the intonation. - Play intervals harmonically or melodically; ascending or descending. - Adjust musical register and timbre of tones to suit your personal preferences. - Track your progress with percentage correct and longest streak of correct guesses, viewable by time frame, so you can see how your ear improves with practice! - Packed full of information on practice suggestions and tips for hearing each of the musical intervals!
HD
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.
- 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
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* The device on which this application is installed must be connected to the HD-300 via Bluetooth®. The application does not produce sound independently. The HD-300 Assistant application allows an instructor to remotely control the HD-300 and provide intuitive guidance to students. ≪ Functions ≫ • HD Control In addition to keyboard and metronome operation, the app allows remote control of temperament and transposition. • Beat, Tempo Setting Irregular meter and tempos can easily be created, saved, and played back. • Individual Volume and Pitch Fine adjustment is available for individual volumes and pitches. • Demonstrate Mode The interference beat that occurs when notes are slightly out of tune can be recreated, and the volumes of harmony notes can be adjusted to give students a feel for appropriate pitch and volume. • Chord Detector Chords can be detected and named based on a group of played notes. • Tuner The tuner provides a convenient means to check pitch. The tuner’s base pitch is adjustable. ・ Rhythm Assistant The app can play the same rhythm as musical score.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Flat or Sharp | HD |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) | 5.0 (3 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | 3 |
| Update frequency | Every 65 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 76 MB |
| Age rating | 4+ | 4+ |
| Developer | Euphorophonics, LLC | Yamaha Corporation |
Customer experience
Flat or Sharp
HD
In-app purchases
Flat or Sharp
- Flat or Sharp Premium (Monthly)2 Months trial$2.991 Month
- Flat or Sharp Premium (Annual)$14.991 Year
- Both Interval Directions$0.99
- Remove Banner Ad$0.99
- All Duration Options$1.99
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- All Accuracy Options$2.99
- BUNDLE - All Premium Options$4.99
HD
No in-app purchases









