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Coldcard vs Trezor Safe 3

Comparing
two wallets
Decided by
Editorial rating
Last reviewed
2026-08-25
Coldcard3.4Bitcoin-onlyWarning

Bitcoin-only air-gapped signer whose seed generation was weakened by a build error from March 2021 until fixed firmware landed on July 31, 2026.

Trezor Safe 34.5

Trezor's $59 entry device, pairing a certified secure element with fully open source firmware and two physical buttons.

Verdict: Trezor Safe 3

Trezor Safe 3 rates higher on our rubric: 4.5 against 3.4 for Coldcard.

Criterion
Editorial rating
Coldcard
3.4
Trezor Safe 3
4.5

Coldcard and Trezor Safe 3, fact by fact

Every row is from the two reviews as of their review dates, with sources on each. A check marks the side a decidable criterion favours; rows without one are information, not a score.

Coldcard and Trezor Safe 3 compared fact by fact from their reviews; a check marks the side a decidable criterion favours.
FactColdcardTrezor Safe 3
Editorial rating3.44.5 (favoured on this row)
StatusCaution: see the reviewAvailable
Made byCoinkiteTrezor
Price$189$59
Who holds the keysself-custodial, keys held behind two secure elements from different vendors, signing air-gapped by choiceself-custodial, keys held in an EAL6+ certified secure element running open source firmware
Bitcoin-onlyYesNo
Runs onWindows, macOS, LinuxAndroid, Windows, macOS, Linux
ScreenQ: 3.2 inch LCD with a full keyboard. Mk5: bright OLED with a numeric keypad0.96 inch monochrome OLED, 128 x 64 pixels, with a two button pad
ConnectivityUSB-C, microSD, NFC, QR scanner on the Q and a virtual disk mode, every path off by defaultUSB-C; Trezor Suite on Windows, macOS, Linux and Android, view only on iOS
ReleasedCoinkite has made Coldcard since 2017; the Q and the Mk5 are the current models2023
Countries on the maker's listNo published listNo published list
Last reviewed2026-08-252026-08-25

Pros and cons, side by side

Coldcard

What works

  • Bitcoin only, which keeps every other chain's parsing code off the device
  • Two secure elements from independent vendors, so one chip flaw is not enough
  • Air-gapped signing over QR, microSD, NFC or virtual disk, with all data paths disabled by default
  • Reproducible open source firmware that advanced users can build and verify themselves
  • Duress PIN, brick PIN and login countdown for coercion scenarios
  • Coinkite's advisory published the technical cause, the entropy estimates and step by step migration instructions

What to watch

  • A March 2021 build error weakened seed generation for over five years, and updating the firmware does not repair an affected seed
  • Migrating means generating a new seed and moving every coin, which costs an on-chain transaction and real care
  • Coinkite publishes no loss total, so the scale rests on outside estimates from TRM Labs and Galaxy Research
  • Steeper learning curve than a Ledger or a Trezor, with no companion app of its own
  • Coinkite publishes no shipping country policy at all

Trezor Safe 3

What works

  • EAL6+ certified secure element and fully open source firmware at $59
  • PIN and passphrase are typed on the device, never on a possibly compromised computer
  • Multi-share (Shamir) backup and FIDO2 two factor support are built in
  • A Bitcoin-only edition is sold alongside the multi coin version

What to watch

  • Two buttons and a 0.96 inch monochrome screen make checking a long address slower than on a touchscreen
  • iOS is view only: no setup, sending or device management from an iPhone
  • SecurityWeek reported in August 2026 that a breach at fulfilment partner ShipMonk exposed about 14,000 customers' shipping details
  • Trezor publishes no list of countries it ships to, only a checkout drop-down

Frequently asked questions

Is Coldcard or Trezor Safe 3 better?

Trezor Safe 3 rates higher on our rubric: 4.5 against 3.4 for Coldcard. The rating follows the product rubric published on our about page; the rows above set custody, price and platforms side by side so you can check it.

Which is cheaper, Coldcard or Trezor Safe 3?

Trezor Safe 3, at $59 against $189, on each maker's own store price as of the review date.

Is Coldcard or Trezor Safe 3 bitcoin-only?

Coldcard is bitcoin-only; Trezor Safe 3 supports other assets too. Multi edition manages thousands of coins and tokens; a separate Bitcoin-only edition is also sold

Does Coldcard or Trezor Safe 3 carry a warning?

Coldcard: A build error introduced in a March 2021 firmware migration left seed generation drawing on a software pseudorandom number generator instead of the hardware one, and attackers found it before Coinkite did. Coinkite published fixed firmware for every affected model and updated its advisory on August 1, 2026, but updating does not repair a seed already generated on affected firmware: those owners have to create a new seed and move their coins.

The full reviews: Coldcard and Trezor Safe 3, each with its sources, and every wallet we review.

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