June 2, 2026
Maxed-out wallet energy
Muxcard, a dyi credit card size computer
A wallet-size computer has people cheering, joking, and asking the only real question: DOOM?
TLDR: Muxcard is a real working computer squeezed into something almost as thin and small as a credit card, aiming to turn your wallet into a tiny gadget hub. Commenters were split between calling it legendary, joking that it’s the most expensive business card ever, and demanding to know if it can run DOOM.
A maker has unveiled Muxcard, a tiny working computer built to be almost the exact size and thickness of a real credit card — and the internet instantly treated it like a mix of sci-fi gadget, hacker toy, and gloriously over-the-top flex. The creator says it could hold tickets, QR codes, door keys, passwords, and even work as a memorable business card. But in the comments, the real action wasn’t just "wow" — it was the classic online split between awe, skepticism, and meme chaos.
Some people were immediately impressed, calling the whole thing "legendary" and admiring the sheer obsession required to shave a computer down until it could pass for something in your wallet. Others went straight for the practical jab: if this becomes a business card, how expensive is that handshake going to be? One commenter dryly noted it might be "a little expensive for a business card," which pretty much sums up the mood of the doubters: cool idea, but are we making a gadget or the world's most extra networking stunt?
Then came the nostalgia squad. One commenter was instantly transported back to old Linux business cards, those tiny bootable discs from the early 2000s, turning the thread into a mini museum of geek history. And of course, because the internet has rules, someone asked the sacred question: "Can it run DOOM?" At that point, Muxcard stopped being just a tiny computer and became a full-on comment-section spectacle.
Key Points
- •Muxcard is presented as a working computer the size of a real credit card, built with an ESP32-C3, e-paper display, and NFC.
- •The project’s design target was to stay near 1 mm total thickness while preserving the look and feel of a normal card.
- •The first prototype is described as a rough but functional proof of concept that revealed real-world assembly constraints beyond CAD design.
- •The creator initially made a custom flexPCB by hand instead of waiting for a manufactured board, using a 3D printer-based lithography approach.
- •The article says development has already advanced from the handmade prototype stage to professionally manufactured prototypes and that a launch is planned.