The Coldcard Q is Coinkite at its most ambitious: a full QWERTY keyboard, a built-in QR scanner for completely wireless air-gapped signing, and a 3.2-inch display on a device powered by AAA batteries. It inherits the same dual Secure Element security architecture as the Mk4 and Mk5 and adds everything that made those devices frustrating to use day to day.
Quick Verdict
The most capable Bitcoin signing device available
The Coldcard line has always prioritized security over convenience. The Mk4 and Mk5 are exceptional signing devices, but the recessed numeric keypad makes typing long passphrases tedious, and microSD-only signing adds friction compared to QR-based wallets like the Foundation Passport. The Q fixes both problems without compromising the security architecture.
At $219, the Q costs $52 more than the Mk5 and $62 more than the Mk4. That premium buys you a keyboard, a camera, and a much larger screen. For users who interact with their Coldcard regularly, it is worth it. For long-term cold storage where the device barely gets touched, the Mk5 is the smarter buy.
Passphrase entry goes from a chore to a normal typing task. The keyboard also makes navigating long menus and entering custom values dramatically faster than the numeric keypad on the Mk4 and Mk5.
Scan unsigned transactions directly from your computer or phone screen. Sign in memory. Display the signed transaction as a QR code. No physical media needs to move between devices at any point in the signing workflow.
Large enough to read transaction details comfortably without squinting. PSBT review, address verification, and menu navigation all benefit significantly from the extra screen real estate versus the Mk4 and Mk5.
The Q runs on standard AAA batteries, making it fully independent of USB power. Useful for air-gap purists who do not want to power the device from a computer port and for traveling setups.
Two card slots mean you can keep one card permanently in the device for transactions and use a second for backups or firmware updates. Minor quality-of-life improvement, but appreciated by heavy users.
The Q includes NFC for broadcasting signed transactions without a computer. NFC is off by default, operates only at centimeter range, and can be disabled at the hardware level by scratching a circuit trace.
The Q adds usability features, not new security features. The core architecture is identical to the Mk4 and Mk5:
The Q supports two independent air-gap signing methods. You can use either or both depending on your preference:
No card, no cable, no physical media. The only bridge between devices is light.
Identical to the workflow on the Mk4 and Mk5. Proven and reliable.
| Price | $219 + shipping (from store.coinkite.com) |
| Display | 3.2-inch LCD, high-brightness |
| Input | Full QWERTY keyboard + function keys |
| Air-gap | QR scanner (built-in camera) + microSD (dual slots) |
| Secure Elements | Microchip ATECC608B + NXP SE050C (dual SE) |
| Power | AAA batteries (included) or USB-C |
| Connectivity | USB-C (power + optional data), NFC (Push TX, off by default) |
| Firmware | Open-source, Bitcoin-only |
| Manufacturer | Coinkite (Canada) |
| Colors | Black, Blue, Clear, Flake, Glow, Jade, Orange, Purple, Red |
Sparrow Wallet is the recommended companion for the Coldcard Q. Setup is straightforward once you understand the PSBT workflow:
The QR signing method is particularly smooth: Sparrow displays the animated PSBT QR, the Q scans it in seconds, and the signed QR pops up on screen immediately after confirmation. The whole round trip takes under a minute.
Same dual Secure Element security, meaningfully different usability. The choice comes down to keyboard and QR versus compactness and price:
| Feature | Coldcard Q$219 | Coldcard Mk5Compact$167 |
|---|---|---|
| Our rating | 9.5 | 9.5 |
| Dual Secure Elements | Yes | Yes |
| Air-gapped (microSD) | Yes | Yes |
| QR scanner (wireless air-gap) | Yes | No |
| Full QWERTY keyboard | Yes | No |
| Display size | 3.2" LCD | 1.54" Gorilla Glass |
| microSD slots | Dual | Single |
| Power source | AAA batteries / USB-C | USB-C only |
| NFC (Push TX) | Off by default | Off by default |
| Open-source firmware | Yes | Yes |
| Bitcoin-only | Yes | Yes |
| Slide-on case included | No | Yes |
| Beginner-friendly | No | No |
Both are premium, air-gapped, Bitcoin-only signing devices with QR support. The differences are in security architecture and interface philosophy:
| Feature | Coldcard Q$219 | Foundation Passport$199 |
|---|---|---|
| QR scanner (air-gap) | Yes | Yes |
| microSD support | Yes | Yes |
| QWERTY keyboard | Yes | D-pad nav |
| Dual Secure Elements | Yes | No |
| Open-source firmware | Yes | Yes |
| Open-source hardware | Yes | Yes |
| Bitcoin-only | Yes | Yes |
| Duress wallet | Yes | No |
| Brick-me PIN | Yes | No |
| AAA battery power | Yes | Yes |
| Beginner-friendly | No | More intuitive UI |
The Coldcard Q is the most capable Bitcoin signing device available. It takes the dual Secure Element security architecture that made the Mk4 and Mk5 the security community's preferred hardware wallets and wraps it in a form factor that is genuinely pleasant to use: full keyboard, big screen, wireless QR air-gap, and battery independence. The $219 price is justified for users who interact with their Coldcard regularly. For infrequently touched cold storage, save $52 and buy the Mk5. But if you want the best, this is it.
The Q adds three things the Mk5 lacks: a full QWERTY keyboard, a built-in QR scanner for completely wireless air-gapped signing, and a much larger 3.2-inch LCD. It also runs on AAA batteries and has dual microSD slots. The security core (dual Secure Elements, open-source Bitcoin-only firmware, duress wallet, brick-me PIN) is identical across both devices. The Q costs $219 versus $167 for the Mk5.
Yes, if you type long BIP39 passphrases regularly or prefer QR-based signing over microSD card handling. The QWERTY keyboard turns passphrase entry from a chore into a normal typing task. The QR scanner eliminates the microSD card entirely for signing workflows. If neither of those matters to you, the Mk5 gives identical security for $52 less.
Two methods. First: the microSD workflow used by all Coldcards. You save a PSBT file to the card, insert it into the Q, sign, and return the card to your computer. Second: QR codes. Sparrow Wallet displays an animated QR code of the unsigned transaction; the Q scans it with its built-in camera, signs in memory, and displays a QR code for Sparrow to scan back. No physical media touches any device in either direction. The QR method is the cleanest air-gap available in a consumer wallet.
No. The Q is powered by AAA batteries, not USB. It can sign transactions using QR codes displayed on a phone screen, with no computer involved. This is the most transport-independent setup available: a wallet that runs on batteries and communicates only through light.
No. The Q is easier to live with than the Mk5 (the keyboard and larger screen reduce friction significantly), but it is still not a beginner device. Setup requires Sparrow Wallet knowledge, understanding of PSBT workflows, and familiarity with why air-gapping matters. If you have never owned a hardware wallet, start with a Trezor Safe 3 or BitBox02. Come back to the Q after six months of practice.
Dual Secure Elements from two different vendors (Microchip ATECC608B and NXP SE050C), anti-phishing PIN-prefix words shown on screen, a duress wallet that opens under a secondary PIN to reveal a decoy balance, a brick-me PIN that permanently destroys the device, countdown login delay, fully open-source and auditable firmware, and a tamper-evident case. NFC for Push TX (off by default). Dice roll entropy for seed generation.
Yes. The Q handles both single-sig and multisig configurations natively, coordinated through Sparrow Wallet. You can run a 2-of-3 multisig with the Q as one signer alongside a Foundation Passport and a BitBox02. Different vendors, different firmware, different attack surfaces. That combination is as close to bulletproof as consumer hardware gets.
Yes. The Q uses the same seed phrase standard (BIP-39) and Coldcard backup format as the Mk4 and Mk5. Your existing backup restores cleanly. Derivation paths and multisig configurations carry over without rebuilding from scratch.
Yes. Every line of firmware is published on GitHub. The hardware schematics are also public. Independent researchers can audit both the code and the circuit board design. Coinkite encourages building the firmware from source and flashing it yourself if you want to verify what is running on the device.
The Q is $219 plus shipping, direct from Coinkite. Always buy directly from store.coinkite.com. Do not buy from Amazon, eBay, or any third-party reseller. Hardware wallets sold through secondary markets have been tampered with to steal funds. Buy direct, verify the tamper-evident bag on arrival, and complete the onboard security check during setup.
Sparrow Wallet is the standard choice and provides the best integration: watch-only wallet, PSBT creation, QR scanning support, full coin control, and multisig coordination. Electrum also works. Both are free and open source. There is no official Coldcard companion app by design; Coinkite builds the signing device and leaves coordination to established wallet software.
Same security, more compact, $52 less
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