Self-custody, compared plainly

Choosing a Hardware Wallet

If you've read the glossary's self-custody entry and want to actually do it, a hardware wallet is the standard way. Here's what three common ones actually offer, compared without a hype ranking — and why a fourth, common one, isn't on this list.

Own a Coldcard? A confirmed, ongoing theft affects seeds generated before a firmware fix. Read the full advisory and remediation steps →

What a hardware wallet is actually for

A hardware wallet is a small device that generates and stores your private keys offline, and signs transactions without ever exposing those keys to an internet-connected computer or phone. The alternative — keeping coins on an exchange, or a key in a software wallet on a normal computer — means trusting that computer, or that exchange, to never be compromised. A hardware wallet narrows the attack surface to the device itself, which is deliberately built to do one thing.

None of this is financial advice, and a hardware wallet doesn't protect you from the one mistake that defeats every device on this list: typing your seed phrase into a website, an app, or telling it to anyone. See the glossary's seed phrase entry, which is flagged for exactly this reason.

Three options, compared

Trezor (Safe 3 / Safe 5 / Safe 7)BitBox02Coldcard
Open sourceFirmware fully open source across the line. Safe 3/Safe 5 hardware is also fully open source; Safe 7's secure element (TROPIC01) is independently auditable per Trezor, a step beyond a typical closed chip but not identical to fully open-source hardware.Bitcoin-only edition is fully open sourceFully open source
Coin supportBitcoin + many altcoinsBitcoin-only or multi-coin editionBitcoin-only, by design
Typical price$59–$249$173.00 (BitBox02) / $204.00 (BitBox02 Nova)$189.00 (Mk5) / $289.00 (Q)
ScreenTouchscreen (Safe 5, Safe 7) or button (Safe 3)Small OLED (Nova: glass display, more scratch-resistant)Larger screen, numeric keypad
Best known forLongest track record. Safe 7 (newest, priciest) adds Bluetooth wireless, wireless charging, and post-quantum firmware signing.Swiss-made, strong open-source Bitcoin focus. Nova is the newer, pricier edition — adds iPhone/iPad support over USB-only BitBox02.Air-gapped operation (microSD/QR, no USB needed)

Prices and lineups change; treat the table above as a snapshot, not a live feed — this page doesn't auto-update from any pricing API, in keeping with the rest of the site.

Not sure yet? Answer three questions

Do you want to manage the wallet from an iPhone or iPad?

Do you want to avoid ever plugging the device into a USB port?

Bitcoin-only, or do you want other coins supported too?

Who each one actually fits

New to self-custody, want the simplest path: Trezor — the most mature companion app and documentation of the three, which matters more than any spec sheet the first time you do this.
Want everything open source, hardware included: Trezor or Coldcard. "Open source firmware" and "open source hardware" are different claims — Trezor is unusual in offering both.
Bitcoin-only, no interest in other coins: Coldcard or BitBox02's Bitcoin-only mode — a narrower device does less, which some people consider a security advantage in itself (less code, less attack surface).
Want to never plug the device into a USB port: Coldcard's air-gapped mode moves transactions over microSD card or QR code instead — the most isolated setup on this list.
Want the newest hardware, wireless and quantum-ready: Trezor Safe 7 — Bluetooth, wireless charging, and firmware signing built on post-quantum cryptography.
Want to manage your wallet from an iPhone or iPad: BitBox02 Nova — the only device on this page with a native iOS/iPadOS app (over Bluetooth), plus a more scratch-resistant glass display than the standard BitBox02.
Own a Coldcard, or generated a seed on one before August 2026? Read this before anything else on this page.

A firmware bug going back to March 2021 caused some Coldcard devices to generate Bitcoin seeds that looked normal but were far easier to guess than intended. Attackers have been actively draining affected wallets since July 30, 2026, with over $100 million confirmed stolen so far and the total still climbing. Updating firmware stops new bad keys from being created — it does not repair a seed that already exists; anyone who generated a Coldcard seed before patching needs to move to a brand-new one.

Read the full timeline, affected firmware versions, what stayed safe, and exact remediation steps →

Why Ledger isn't on this page

Ledger is one of the best-known names in this space, and it's deliberately left off the comparison above rather than just quietly omitted. Two facts, both checkable, explain why:

Its secure element firmware is closed source. Unlike the other three devices here, independent researchers can't audit what Ledger's firmware actually does — you're trusting the company's word, not verifiable code. That's a meaningfully different security model from "open source, audit it yourself."

In May 2023, Ledger announced (then paused after backlash) a feature called Ledger Recover — an opt-in service that would encrypt a user's seed, split it into fragments via Shamir's Secret Sharing, and store those fragments with three custodians (including Ledger itself) for identity-verified recovery. Whatever its intent, the announcement proved something the security community had long assumed was architecturally impossible: Ledger's closed-source firmware has the technical capability to export a user's seed off the device. Critics called that capability itself a backdoor, regardless of whether any individual user opts in — because with closed-source firmware, no outside party can independently confirm which capabilities exist in any given update, opted-in or not.

Self-custody's entire premise, laid out in the glossary, is "no counterparty to fail." A device whose vendor has demonstrated — by their own announcement, not a leak or an accusation — that the seed can leave the device under closed-source firmware undermines that premise enough that this page doesn't recommend it or link to it. This is a judgment call, not an independently audited fact about current firmware behavior; readers who've done their own research and reach a different conclusion should trust that research over this paragraph.

The one rule that outranks this whole page

Buy directly from the manufacturer or an authorized reseller, never a marketplace listing or a used device from someone you don't know — a tampered device is a real, documented attack vector. Set it up yourself, write the seed phrase down on paper (never a photo, never a password manager, never typed anywhere), and verify the device's authenticity check on first setup. Every wallet on this page explains this in its own setup flow; follow it.

Disclosure: every Trezor and BitBox02 link in the table below is an affiliate link — if you buy through one, this site earns a small commission at no extra cost to you. The Coldcard link is not (no affiliate relationship exists with them). The comparison and rankings on this page were written before any affiliate relationship existed, and none of it was adjusted afterward to favor either brand — this page will say so plainly if that ever changes.

Common comparisons, answered directly

Trezor vs. Coldcard: which is better?

Neither is strictly better — they optimize for different things. Trezor has the longer track record, the most mature companion app, and (with Safe 3/Safe 5) fully open-source hardware, not just firmware — a better fit for a first hardware wallet. Coldcard is Bitcoin-only, fully open source, and built for air-gapped operation (microSD or QR, no USB needed) — a better fit if you never want to plug the device into a computer. See the full comparison table above for specs side by side.

BitBox02 vs. Trezor: which should I buy?

BitBox02 is Swiss-made with a strong open-source Bitcoin focus and, in the Nova edition, the only native iPhone/iPad app of the three devices here. Trezor has a longer track record and a broader companion-app ecosystem, plus fully open-source hardware on the Safe 3/Safe 5 models. If mobile-first setup matters most, BitBox02 Nova fits; if the widest documentation and community track record matters most, Trezor fits.

Is Coldcard safe to use in 2026?

Current-firmware Coldcard devices are not affected by the seed-randomness bug described in the advisory above — the flaw was patched, and new seeds generated on updated firmware are not at risk. The real question is whether a specific device's seed was generated before the fix (going back to March 2021): if so, that seed needs to move to a fresh one regardless of how long it's been in use. Read the full advisory to check your firmware version and remediation steps.

What's the best hardware wallet overall?

There isn't a single "best" — it depends what you're optimizing for, which is why this page compares rather than ranks. New to self-custody: Trezor. Want everything open source, hardware included: Trezor or Coldcard. Bitcoin-only with the smallest attack surface: Coldcard or BitBox02's Bitcoin-only mode. Managing from an iPhone or iPad: BitBox02 Nova. See "Who each one actually fits" above for the full breakdown.

Where to get one

DevicePriceWhy choose this one
Trezor — browse all models $59–$249 Not sure which Trezor yet? See the full current lineup and pricing. Visit Trezor →
Trezor Safe 3 $59 Cheapest way in. Button-based, not touchscreen, but fully open source hardware and firmware. Shop Safe 3 →
Trezor Safe 5 $129 Touchscreen, still fully open source hardware + firmware — the middle ground. Shop Safe 5 →
Trezor Safe 7 $249 Newest flagship: Bluetooth, wireless charging, post-quantum firmware signing. Shop Safe 7 →
BitBox02 $173.00 Swiss-made, strong open-source Bitcoin focus, Bitcoin-only edition available. Shop BitBox02 →
BitBox02 Nova $204.00 Newer, pricier BitBox edition: adds iPhone/iPad support and a glass display over the standard BitBox02. Shop BitBox02 Nova →
Coldcard Mk5 $189.00 Fully open source, Bitcoin-only, air-gapped operation. Read the security advisory above before generating a new seed. Shop Mk5 →
Coldcard Q $289.00 Same open-source, air-gapped design as Mk5, plus a QR scanner and full keyboard. Read the security advisory above before generating a new seed. Shop Q →