Show HN Pianoboi – displays sheet music as you play your piano
I made a software library for displaying piano music 7 years back, and recently ported it to the web (which is now easier than even ever). It displays sheet music as you play, and let's you take snapshots of specific chords, then keeps a running list of chords as keyboard visuals (instead of just displaying sheet music). Just a simple tool for songwriting/ figuring out songs by ear, or just understanding music key theory (which I'm admittedly a still a beginner at).
In plain words
Show HN Pianoboi is a web-based tool that displays sheet music in real-time as you play piano. It allows users to capture specific chords and build a running visual reference of keyboard layouts instead of traditional notation. Designed for musicians interested in songwriting, learning songs by ear, or exploring music theory, the tool offers a straightforward approach to understanding harmonic progressions and chord structures.
written from the facts on this page · September 2026
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