Comparison

Tonality Visualizer vs Piano Chord

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

Head to head
About

Tonality Visualizer

Features
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Tonality Visualizer is an interactive polar-pitch map that displays musical notes on a rotating disk. You can connect a MIDI keyboard or open a MIDI file — every note appears in real time. The app helps you see harmony, motion, and chord relationships, even without formal music theory. Main Features •MIDI Input: visualize notes directly from your keyboard or MIDI device. •MIDI File Playback / Trainer Mode: play or practice chord by chord. •Live Sound Option: enable/disable the built-in synth for input playback. •Physics-based Disk Rotation: the disk moves naturally according to musical torque. •Simple UI: switch between water-fixed / disk-fixed anchors, toggle UI visibility, bilingual JP/EN. Perfect for music learners, creators, and anyone who wants to “see” sound. Privacy No data collection. All processing happens locally on your device. License Open-source under the MIT License. Source code available on GitHub. Supported Formats •.mid / .midi files (Format 0 / 1) •CoreMIDI device input

About

Piano Chord

Features
Read full description

Piano Chordは、ピアノのコードを直感的に鳴らすことができる音楽アプリです。 【3つのモード】 ■ 再生モード ルート (CDEFGAB + # )の12音と、16種のコードをタップすることで直感的にコードの演奏が可能。 鍵盤ハイライトでコードの構成音を視覚的に確認できます。 ■ コード進行モード 4つのコードを登録してループ再生が可能。 再生しながらリアルタイムでコードを変更できるのでセッションや作曲のアイデア出しに最適です。 ■ マルチビューモード 4画面・8画面で複数のコードを同時に比較。コード同士の響きの違いを直感的に把握できます。 【主な機能】 ・16種のコード(トライアド・7th・6th/9th) ・5種のスケール(メジャー・マイナー・ペンタトニック・ブルース) ・SoundFont音源によるリアルタイム発音 ・ルート音カラーと構成音カラーのカスタマイズ ・マスター音量・トランスポーズ設定

Screenshots

Tonality Visualizer3 screens
Piano Chord4 screens

Verdict

The call

The clearest difference is update cadence: Piano Chord at every 5 days against Tonality Visualizer's fortnightly. Piano Chord also leads on iOS requirement (13.0 vs 18.6). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Tonality Visualizer ships an update fortnightly, Piano Chord every 5 days. The most recent releases landed on October 25, 2026 and October 19, 2026 respectively.

Scorecard2 real differences · 4 level
Tonality Visualizer versus Piano Chord: the parameters behind the verdict, then further details
ParameterTonality VisualizerPiano Chord
PriceFreeFree
Update frequencyFortnightlyEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.613.0 — better
Further details — not scored
Size39 MB167 MB
Age rating4+4+
DeveloperYusuke YoshidaHideaki Sato

In-app purchases

None

Tonality Visualizer

No in-app purchases

None

Piano Chord

No in-app purchases

Questions

Is Tonality Visualizer free?
Tonality Visualizer is free to download, with no in-app purchases.
Is Piano Chord free?
Piano Chord is free to download, with no in-app purchases.
Do Tonality Visualizer or Piano Chord have ads?
Neither Tonality Visualizer nor Piano Chord shows ads.
Which is updated more often, Tonality Visualizer or Piano Chord?
Tonality Visualizer ships an update fortnightly, and Piano Chord every 5 days. Most recently, Tonality Visualizer was updated on October 25, 2026 and Piano Chord on October 19, 2026.

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