Comparison

HD vs Harmony Keyboard

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

* 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.

About

Harmony Keyboard

Features
Read full description

Train perfect intonation with just intonation. Harmony Keyboard is a powerful practice tool designed for musicians who want accurate tuning and beautiful harmony. It helps you hear and practice chords using both just intonation and equal temperament, making it ideal for ensemble rehearsal, wind band practice, choir training, and ear training. Whether you're a student, performer, or teacher, Harmony Keyboard helps develop a better sense of pitch and harmonic balance. KEY FEATURES • Just Intonation & Equal Temperament Switch between tuning systems to understand how harmony and tuning work in real music. • Intonation Training Practice tuning chords and intervals to develop a precise musical ear. • Instant Transposition Transpose instantly to any key for flexible practice. • Hold Function Sustain notes and chords while listening carefully to intonation and balance. • Wind Instrument Sounds Includes sounds such as flute, clarinet, and saxophone for realistic ensemble practice. • Customizable Tuning Adjust reference pitch (e.g. A=442Hz) and note name display. PERFECT FOR • Wind band practice • Brass and woodwind players • Choir rehearsal • Ear training • Music students and teachers Harmony Keyboard is a simple yet powerful tool for musicians who care about tuning, harmony, and musical precision.

Screenshots

HD4 screens
Harmony Keyboard4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 5 level
HD versus Harmony Keyboard: the parameters behind the verdict, then further details
ParameterHDHarmony Keyboard
PriceFreeFree
Rating5.0 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyEvery 10 monthsEvery 5 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size76 MB45 MB
Age rating4+4+
DeveloperYamaha CorporationSINCLAIR SYSTEM

In-app purchases

None

HD

No in-app purchases

1 purchases

Harmony Keyboard

Subscriptions1
  • Pro Version$0.491 Month

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.

Other comparisons