Muxcard, a dyi credit card size computer

2026-05-31 | original

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Why This Matters

Muxcard represents a significant advancement in miniaturized computing, offering a fully functional credit card-sized device that combines NFC, a display, and versatile applications. Its compact design opens new possibilities for personal security, smart home control, and innovative business cards, pushing the boundaries of what small-scale tech can achieve. This development could inspire a new wave of ultra-portable, multifunctional gadgets in the tech industry and consumer market.

Key Takeaways

It is a credit card-sized computer with NFC, display, and versatile functions.
Potential uses include digital wallets, security keys, and smart home controls.
Its ultra-compact design challenges existing notions of portable tech devices.

Muxcard

A fully working computer that is literally the size of a credit card.

Built around an ESP32-C3, e-paper display and NFC.

The video below shows a little visual demo on just a few things that could be possible.

MC02-720p.mov

So many things could be possible with this, including:

Minimalist wallet for QR codes, NFC keys, tickets, boarding passes etc.

Pentesting & Ethical Hacking similar to Flipper Zero

Smart-home dashboard & control

Offline password, 2FA, crypto wallet

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