New to music theory? PianoChord puts lookup, playback, and practice in your pocket—336 chords, 156 scales, and 29 theory articles, all offline. LIBRARY · Filter by root and category: triads, sevenths, extensions, sus, scales · Detail pages: notes, degrees, theory tips, memorization curve · Block & arpeggio playback; favorites and recent items CHORD LOOKUP · Tap keys to identify chord names and structures · Jump to full detail in one tap DIATONIC & PROGRESSIONS · Diatonic chords in 12 keys (major/minor, triads & sevenths) · Edit progressions; presets like I–V–vi–IV and ii–V–I · Waterfall visualization with playback VOICING · Inversions, Drop2 / Drop3; compare sounds instantly METRONOME & THEORY · BPM, time signature, accents · 29 articles in 5 categories for beginners 11 LANGUAGES · UI in 11 languages; chord copy and theory articles localized (English fallback) · Dark, clean UI · Local storage, no sign-up Download PianoChord—look up, listen, and learn your first C major today. Privacy Policy: https://cy.xyysh.top/privacy/pianochord Terms: https://cy.xyysh.top/terms/pianochord