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

A fridge magnet shopping list device using an M5Stack PaperMono with an e-ink touchscreen, connected to a mobile web app via Wi-Fi. It works offline and is built with 2,400 lines of C++ code. The firmware uses Wi-Fi only and was developed using Claude Code, not hand-written. It is already in daily use by the family.

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PublishedSeptember 28, 2026seamus_c
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WHY IT MAY MATTER

This device offers a practical solution for a family shopping list with offline functionality and mobile synchronization. It demonstrates the potential of using AI-assisted coding for hardware development.

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