Decimen Optical Transfer

I've been using Claude Code to build a cached web app MP3 player (got really tired of online music streaming quality, and ads). I wanted to try adding a phone to phone file transfer option without requiring the phones to be on the same network, when I realized rapidly flashing QR codes might be a possible method. I used Claude Code to build this working POC.

Decimen Optical Transfer: Transfer files with light. Send a file or a block of text from one screen to another device's camera. No account, pairing, cloud storage, or network path between devices. Free, open source, and no ads.