The size of a credit card: This fully functional computer even packs an e-ink screen

An open-source developer built Muxcard, a 1mm-thick, credit-card-sized computer.

The device packs an ESP32-C3, E Ink display, NFC, sensors, Bluetooth, and Wi‑Fi into a wallet-sized form factor.

Flexible boards and custom assembly made the ultra-thin design possible.

The project highlights how low-power, compact hardware could support future identity, authentication, and ambient computing tools.