Show HN: PaperMono, e-ink fridge magnet shopping list with mobile web page

PaperMono is firmware for the M5Stack PaperMono e-paper device, transforming it into a fridge magnet shopping list. It synchronizes with a phone web app via Wi-Fi, either hourly, on tap, or after each edit. The system uses a server with FastAPI and SQLite, and new item names can optionally be sent to Claude Code CLI. The project is licensed under the GNU General Public License v3.0, deriving from MonoMesh.

Unlike other shopping list apps, this project uniquely integrates an e-ink display with a web app, offering both physical and digital synchronization for household use.