Coldcard Q

Overview

The Coldcard Q is Coinkite's power-user flagship — everything the Mk4 does, plus the hardware that makes advanced Bitcoin custody far more comfortable. It adds a full QWERTY keyboard, a built-in QR scanner and larger display for camera-based air-gapped workflows, dual microSD slots, and a rechargeable battery. If the Mk4's keypad-and-tiny-screen experience put you off, the Q is the answer while keeping the same paranoid, Bitcoin-only philosophy.

It's designed around air-gapped operation: you can sign transactions entirely via QR codes or microSD, never connecting to a computer. The QWERTY keyboard makes entering long passphrases and BIP-39 words genuinely practical, which matters a lot for multisig setups. It keeps the Coldcard hallmarks — dual secure elements, open-source firmware, duress/trick PINs, strong multisig support, and BIP-85.

The trade-offs are cost and scope. It's noticeably more expensive than the Mk4, and it remains Bitcoin-only. It's also still a device aimed at people who want deep control; casual users holding a modest amount may be over-served and would be happier with something simpler like a BitBox02 or Trezor. But for multisig practitioners and QR-air-gap enthusiasts who want a real keyboard and screen, the Q is the most capable option Coinkite makes.