PaperMono, e-ink fridge magnet shopping list with mobile web page
Details
- External ID
- 49875801
- Source
- HN
- Company
- —
- Product
- PaperMono, e-ink fridge magnet shopping list with mobile web page
- Website domain
- github.com
- Launched
- Sept. 28, 2026
- Cohort
- —
- Upvotes
- 149
- Upvotes percentile
- 0.9497607655502392
- Tags
- —
- Fetched at
- Sept. 30, 2026, 5:01 p.m.
- Updated at
- Sept. 30, 2026, 5:01 p.m.
Description
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++.This 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.Fully 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.As 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
Enrichment
- Theme
- hardware hacking and device utilities
- Vertical
- Horizontal
- Function
- Hardware & robotics
- Audience
- B2C
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- e-ink fridge magnet shopping list for households
- Manually corrected
- False
Could you build this?
Partial The companion web app and basic HTTP communication are simple, but writing robust embedded C++ firmware for ESP32 e-ink screens with memory constraints and power management requires physical hardware tinkering.
What it would actually take: The stack consists of an ESP-IDF or Arduino C++ firmware running on an ESP32-S3 microcontroller communicating via HTTP/WebSocket or BLE to a lightweight web service. The challenging parts are low-level e-ink partial refresh waveform handling, managing ESP32 SRAM limitations, deep sleep power cycling, and local flash persistence. Building it requires an electrical engineering or embedded systems background and hands-on hardware debugging tools.
Discussion
20 comments analyzed.
Competitors mentioned: Zectrix, Xteink, Kindle, HomePod with screen, PaperMario
Concerns raised: Vibe-coded projects lack novelty, Requiring UPC info for store aisle APIs, Sticky notes falling off
Feature requests: 10" or 12" countertop display, Voice dictation via microphone, Recipe and meal planning mode, Aisle-by-aisle sorting
Competitors
Other products that read as similar to this one — 41 launches clear the similarity bar, closest 8 shown.
Attention rank: #6 of 42 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 313 days after the earliest competitor.
- papermono-shopping-list · github · 2026-09-27 · 176 upvotes · similarity 0.60
- Metalio-E-INK4 · github · 2026-09-14 · 9 upvotes · similarity 0.42
- List stuff to borrow for your people, anonymously · hn · 2026-08-12 · 5 upvotes · similarity 0.39
- Platevio · ph · 2026-09-09 · 3 upvotes · similarity 0.37
- Ember · hn · 2025-12-06 · 7 upvotes · similarity 0.37
- supvan-katasymbol-printer-web-ui · github · 2026-09-27 · 9 upvotes · similarity 0.37
- F32 · hn · 2025-11-19 · 302 upvotes · similarity 0.37
- OrderPrint · ph · 2026-09-10 · 2 upvotes · similarity 0.37
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a hardware & robotics tool for Fintech yet.