A Credit Card-Sized Computer

If you had a fully functional, credit card-sized computer that could fit in your wallet, what would you do with it? No, seriously — we need to know. This isn’t an academic exercise; GitHub user krauseler built one, but isn’t exactly sure what to do with it. There has to be a killer app for an ultra-thin computer like this, but even if I can’t figure out what that is, I still want one.

Called the Muxcard, krauseler’s creation is a programmable computer that matches the footprint — and nearly the thickness — of a real ISO7816 smart card. We’re not talking about a chunky “credit card-sized” gadget that bulges in your wallet. The Muxcard measures 1 mm in thickness, just barely more than an actual payment card.

Now that's thin! (📷: krauseler)

Inside the paper-thin package is an ESP32-C3 microcontroller, a 1.54-inch flexible E Ink display, NFC hardware, an...

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