{"slug": "show-hn-papermono-e-ink-fridge-magnet-shopping-list-with-mobile-web-page", "title": "Show HN: PaperMono, e-ink fridge magnet shopping list with mobile web page", "summary": "A developer built PaperMono, an e-ink fridge-magnet shopping list running on an M5Stack PaperMono board (ESP32-S3 with e-ink touchscreen) that syncs with a mobile web page over Wi-Fi and works offline, comprising roughly 2,400 lines of C++. The firmware was fully generated with Claude Code rather than hand-written, and the developer reports the device is already in daily family use.", "body_md": "Fridge magnet shopping list on an M5Stack PaperMono (ESP32-S3, e-ink touchscreen), synced with a phone web app over Wi-Fi. Works offline, ~2,400 lines of C++.\n\nThis is a great wee device! BLE, Wi-Fi and LoRa on one board makes it flexible for way more than a shopping list, this is just what I built first. This firmware only uses Wi-Fi.\n\nFully vibe-coded with Claude Code, I didn't hand-write this. I wanted to see how Claude would get on with building something useful for a new hardware device.\n\nAs it's stuck to the fridge it's easy for the family to use, and it's already being used day to day which I'll admit is a first for a home built project like this\n\nComments URL: [https://news.ycombinator.com/item?id=49875801](https://news.ycombinator.com/item?id=49875801)\n\nPoints: 2\n\n# Comments: 0", "url": "https://wpnews.pro/news/show-hn-papermono-e-ink-fridge-magnet-shopping-list-with-mobile-web-page", "canonical_source": "https://github.com/seamusc/papermono-shopping-list", "published_at": "2026-09-28 10:14:41+00:00", "updated_at": "2026-09-28 10:48:08.046336+00:00", "lang": "en", "topics": ["ai-tools", "developer-tools"], "entities": ["PaperMono", "M5Stack PaperMono", "ESP32-S3", "Claude Code", "Anthropic"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/show-hn-papermono-e-ink-fridge-magnet-shopping-list-with-mobile-web-page", "markdown": "https://wpnews.pro/news/show-hn-papermono-e-ink-fridge-magnet-shopping-list-with-mobile-web-page.md", "text": "https://wpnews.pro/news/show-hn-papermono-e-ink-fridge-magnet-shopping-list-with-mobile-web-page.txt", "jsonld": "https://wpnews.pro/news/show-hn-papermono-e-ink-fridge-magnet-shopping-list-with-mobile-web-page.jsonld"}}