Coinkite's workhorse versus their flagship. Is the Q worth $71 more? Both use identical security architecture with dual secure elements from different manufacturers (Microchip ATECC608 and Maxim DS28C36B), verifiable source code, and the same paranoid feature set. The Q adds a full QWERTY keyboard, 3.2" color LCD, dedicated QR scanner, dual MicroSD slots, NFC, and AAA battery power. The Mk4 is smaller and lighter.
Buying Advice
New to Coldcard? Get the Q — the keyboard alone justifies the price. Already own an Mk4? Keep it. But honestly, consider the Jade Plus instead — it's $100 less than the Q, fully open source, and has broader wallet compatibility.
The Bottom Line
The Q wins for new buyers. The keyboard transforms passphrase management — typing complex passphrases on the Mk4's numeric pad is genuinely painful. The dual SD slots are useful for separating unsigned and signed transactions. The larger screen makes verification easier. However, the Q has worse wallet compatibility than the Mk4 since it relies heavily on QR/BBQr, limiting it primarily to Sparrow and Nunchuk. If you're using other coordinator software, that matters.
Under the Hood: Security
Let's get into what actually matters: how these wallets protect your bitcoin.
- Coldcard Mk4: Dual secure elements with extensive anti-tampering. Designed for maximum paranoia with duress features.
- Coldcard Q: Dual secure elements with extensive anti-tampering. QWERTY keyboard for easier passphrase entry.
Neither wallet is fully open-source. That's a problem. When you can't audit the code, you're trusting marketing departments instead of cryptographers. Consider alternatives with verifiable security.
Side-by-Side Comparison
The specs that matter for Bitcoin security.
| Feature | Coldcard Mk4 | Coldcard Q |
|---|---|---|
| Price | $178 | $249 |
| Bitcoin-Only | Yes | Yes |
| Open-Source | No | No |
| Air-Gapped | Yes | Yes |
| Secure Element | Dual ATECC608A secure elements (belt and suspenders approach) | Dual ATECC608B secure elements |
| Connection | MicroSD (air-gapped), USB-C, NFC | MicroSD (air-gapped), USB-C, NFC, QR codes |
My Recommendation
The Coldcard Q is the enthusiast's choice. At $249, it's not cheap. But if you use passphrases regularly, the keyboard alone justifies the upgrade from Mk4. Add QR code support and NFC for PSBTs, and you have the most feature-complete Coldcard ever. The large form factor won't fit in your pocket, but it'll sit nicely on a desk. For power users who want maximum flexibility, this is it.
What Coldcard Q Does Better
Best for: Users who frequently use passphrases, Those who found Mk4 keyboard tedious, Security-focused Bitcoiners who want latest features, Power users who need maximum flexibility.
Coldcard Mk4's Weaknesses
Price & Value
Coldcard Mk4 costs less at $178, but the $71 you'd save isn't worth the trade-offs. Coldcard Q earns its price tag.
Market Context
Hardware wallets aren't going away. As more people realize exchanges aren't safe, devices like Coldcard Mk4 and Coldcard Q become more important. The question isn't whether to self-custody. It's how.
Common Questions
Can I store other cryptocurrencies on these wallets?
No. Both are Bitcoin-only, which I consider a feature. Less code means fewer vulnerabilities.
Is the price difference worth it?
The winner costs more, but the security features justify it.
Are Coldcard Mk4 and Coldcard Q Bitcoin-only?
Yes, both are Bitcoin-only wallets with no altcoin support.
Do Coldcard Mk4 and Coldcard Q support multisig?
Most modern hardware wallets support multisig setups. Check the individual reviews for specifics on each wallet's multisig implementation and supported coordinators.
Full Reviews
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Compare Coldcard Q to:
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