Coldcard Mk4 runs Bitcoin-only firmware. NGRAVE ZERO decided to support altcoins too. One of these approaches is correct. But I'll lay out the full picture so you can see for yourself.
I got hands-on with both of these. Setup, daily use, edge cases. Let me walk you through what I learned.
The Bottom Line
Coldcard Mk4 wins by virtue of being Bitcoin-only. Why would you trust your sats to a device cluttered with altcoin code?
Coldcard Mk4's Advantages
Bitcoin-only focus (reduced attack surface). Fully air-gapped operation. MicroSD for PSBT signing.
Best for: Security-paranoid Bitcoiners, Users who might face physical coercion, Technical users comfortable with complex devices, Large holders who want maximum protection.
What Holds NGRAVE ZERO Back
- Multi-coin support introduces unnecessary risk
- Very expensive
- Multi-coin support
- Overkill for most users
The core issue: NGRAVE ZERO supports altcoins. For serious Bitcoin storage, that's a liability, not a feature.
Feature Comparison
The specs that matter for Bitcoin security.
| Feature | Coldcard Mk4 | NGRAVE ZERO |
|---|---|---|
| Price | $178 | $398 |
| Bitcoin-Only | Yes | No |
| Open-Source | No | No |
| Air-Gapped | Yes | Yes |
| Secure Element | Dual ATECC608A secure elements (belt and suspenders approach) | EAL7 certified (highest level) |
| Connection | MicroSD (air-gapped), USB-C, NFC | QR codes only (no ports at all) |
Under the Hood: Security
Security is the whole point. Everything else is secondary. Here's how these two handle it:
- Coldcard Mk4: Dual secure elements with extensive anti-tampering. Designed for maximum paranoia with duress features.
- NGRAVE ZERO: Air-gapped with biometric and secure element. Premium security features.
Both wallets keep their firmware closed. That means you're trusting the company, not the code. For serious bitcoin storage, I'd rather see open-source firmware.
My Recommendation
The Coldcard Mk4 is the gold standard for paranoid security. The duress features alone set it apart. But let's be real: most people don't need this level of protection. The UX is clunky. The screen is small. The numeric keypad makes passphrases tedious. If you're a high-value target or just paranoid, get it. If you want a smooth daily driver, the Jade Plus is more practical.
On Altcoin Support
Every altcoin NGRAVE ZERO supports is code that could compromise your bitcoin keys. Coldcard Mk4 doesn't carry that weight. Bitcoin-only firmware is leaner and more auditable.
What You Pay
At $178, Coldcard Mk4 costs $220 less than NGRAVE ZERO and delivers a better experience. That's a good deal.
Market Context
The hardware wallet market has matured. Coldcard Mk4 and NGRAVE ZERO represent two approaches to the same problem: keeping your bitcoin safe from everyone except you. The wallets that survive long-term will be the ones that take security seriously and respect the self-custody ethos.
Who Should Buy Which?
Budget-conscious? Coldcard Mk4 costs less. Security-focused? Go with Coldcard Mk4. New to self-custody? Either will work, but start with the one that keeps things simple.
What People Ask
Can I store other cryptocurrencies on these wallets?
NGRAVE ZERO supports altcoins. Coldcard Mk4 is Bitcoin-only. I recommend the Bitcoin-only option.
Do Coldcard Mk4 and NGRAVE ZERO support multisig?
Most modern hardware wallets support multisig setups. Check the individual reviews for specifics on each wallet's multisig implementation and supported coordinators.
Is the price difference worth it?
The winner is also cheaper. Sometimes that happens.
Can I use my existing seed phrase?
Both wallets support standard BIP39 seed phrases. You can import your existing 12 or 24-word recovery phrase from any compatible wallet.
Full Reviews
Compare Coldcard Mk4 to:
Compare NGRAVE ZERO to:
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