Show HN: PianoFun – Browser piano learning game with MIDI (vanilla JavaScript)
My daughter is learning piano, and I saw someone on X who vibe-coded a similar app for their kid. So I plugged a USB cable into our 10-year-old Casio AP-450, fired up Claude Code, and had a working falling-note game in minutes.
My daughter immediately became the product manager — she requested a beat toggle, caught that long notes disappeared too fast on keypress, and spotted visual overlaps I completely missed.
Deliberately vanilla JS/HTML/CSS — no frameworks, no build step. Setup is: USB cable + Chrome + open index.html.
Open source (GPL-3.0): https://github.com/victorantos/PianoFun Nice job - reminds me of the old game Synthesia which uses a similar falling note approach to teach piano. One nice thing about it is that it lets you switch between the following notes and actual grand staff sheet music. If she’s interested in learning to play by ear, I created an educational game called Lend Me Your Ears in the style of the old “Simon” toy. It presents players with a sequence of musical notes that increases over time and challenges them to reproduce it by ear using either an on-screen piano, a connected MIDI keyboard, or an acoustic instrument. The inspiration was this post by @RG_Leachman on X: https://x.com/RG_Leachman/status/2035537289812816128 They vibe-coded a piano app for their daughter, and since my daughter is also learning piano I figured I'd give it a shot. The whole thing came together in minutes with Claude Code. My daughter immediately started giving feedback — she's basically the product manager now. Full story on my blog: https://victorantos.com/posts/hold-my-beer-i-vibe-coded-a-pi...