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Coinkite COLDCARD Mk5 or Trezor Safe 3?

The exact editions, side by side: how you’ll use them and the limits to know.

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In short

Transaction approval (iPhone) is confirmed only for Coinkite COLDCARD Mk5.

Coinkite COLDCARD Mk5One edition

Price at Coinkite

Trezor Safe 3Multi-coin edition

Price at Trezor

Approve transactions

Computer: Coinkite COLDCARD Mk5:
microSDSparrow · Bitcoin
USBSparrow · BitcoinMk5 set up and unlocked · verified current firmware · USB data enabled · data cable; Trezor Safe 3:
USBTrezor Suite · Bitcoin / Ethereum
iPhone: Coinkite COLDCARD Mk5:
NFCNunchuk · Bitcoin
iPhone · Nunchuk · NFC · BitcoinSupport for wallet setup is unconfirmed; Trezor Safe 3:
Not supported
Android: Coinkite COLDCARD Mk5:
NFCNunchuk · Bitcoin
Android · Nunchuk · NFC · BitcoinSupport for wallet setup is unconfirmed; Trezor Safe 3:
USBTrezor Suite · Bitcoin / EthereumAndroid 12+

Where they differ

Cryptocurrencies: Coinkite COLDCARD Mk5:Bitcoin-only; Trezor Safe 3:Multiple cryptocurrencies

What they have in common

Controls / Display: Physical buttonsDisplay: Display without touch input
Both
Wallet recovery: Recovery phrase
Both
Operating power: USB power
Both
Battery: No battery
Both

Before you choose

Consider

Coinkite COLDCARD Mk5Needs USB-C power during use. Check the current seed-generation advisory before reusing an older wallet; updating alone does not repair an affected seed.

Trezor Safe 3USB signing on computer or Android; the iPhone app does not let this model approve transactions.

Apps and requirements

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Connectivity

Coinkite COLDCARD Mk5

Computer

SparrowmicroSDBitcoinWindows · macOS · Linux

Connection requirements

Sparrow exchanges unsigned and signed Bitcoin transaction files (PSBTs) with Mk5 through microSD. Your computer needs a compatible card reader.

SparrowUSBBitcoinWindows · macOS · LinuxMk5 set up and unlocked · verified current firmware · USB data enabled · data cable

Connection requirements

Start with a Mk5 already initialized under its setup guide, running the verified current recommended standard firmware. Keep Mk5 unlocked, enable USB data and use a data-capable USB-C cable. Then add its wallet to Sparrow and sign Bitcoin transactions over USB.

iPhone · Android

NunchukNFCBitcoinSupport for wallet setup is unconfirmed

Connection requirements

Use Nunchuk on a compatible NFC phone with an already initialized Mk5, powered on and with NFC enabled. Import the wallet’s public account into Nunchuk before exchanging Bitcoin transaction files (PSBTs).

Trezor Safe 3

Computer

Trezor SuiteUSBBitcoin / EthereumWindows · macOS · Linux

Android

Trezor SuiteUSBBitcoin / EthereumAndroid 12+

Connection requirements

Setup and signing use the Trezor Suite app on Android 12 or later over USB. Your phone needs USB-C support and a suitable data cable. Check that Suite supports the asset and network you want to use; the Bitcoin-only edition is limited to Bitcoin.

Hardware detailsDifferent: 2 · Same: 2 · Not fully recorded: 9Show details (13)Hide details

Coinkite COLDCARD Mk5Trezor Safe 3

Display

Display type: Coinkite COLDCARD Mk5:LCD; Trezor Safe 3:OLED
Screen diagonal: Coinkite COLDCARD Mk5:1.54″; Trezor Safe 3:0.96″
Colour mode: MonochromeBoth
Resolution: Coinkite COLDCARD Mk5:Not recorded; Trezor Safe 3:128 × 64 px

Device connections

USB port: USB-CBoth
Memory card slot: Coinkite COLDCARD Mk5:microSD; Trezor Safe 3:Not recorded

Size and weight

Dimensions: Coinkite COLDCARD Mk5:Not recorded; Trezor Safe 3:59 × 32 × 7.4 mmDimensions as listed by the manufacturer
Device weight: Coinkite COLDCARD Mk5:Not recorded; Trezor Safe 3:14 g

Materials and finish

Materials: Coinkite COLDCARD Mk5:Not recorded; Trezor Safe 3:Casing: PMMA plastic · Backplate: Aluminium (Anodized finish)

Security and software

Security chip: Coinkite COLDCARD Mk5:Not recorded; Trezor Safe 3:CC EAL6+
Conformity marks: Coinkite COLDCARD Mk5:Not recorded; Trezor Safe 3:CE · RoHS