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Coinkite COLDCARD Q 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 Q.

Coinkite COLDCARD QOne edition

Price at Coinkite

Trezor Safe 3Multiple cryptocurrencies

Price at Trezor

Approve transactions

Computer: Coinkite COLDCARD Q:
microSDSparrow · Bitcoin
QRSparrow · Bitcoin
USBSparrow · BitcoinQ already set up and unlocked · USB enabled · data cable required; Trezor Safe 3:
USBTrezor Suite · Bitcoin / Ethereum
iPhone: Coinkite COLDCARD Q:
NFCNunchuk · Bitcoin
iPhone · Nunchuk · NFC · BitcoinSupport for wallet setup is unconfirmed; Trezor Safe 3:
Not supported
Android: Coinkite COLDCARD Q:
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 Q:Bitcoin-only; Trezor Safe 3:Multiple cryptocurrencies
Operating power: Coinkite COLDCARD Q:Batteries or USB power; Trezor Safe 3:USB power
Battery: Coinkite COLDCARD Q:Replaceable batteries; Trezor Safe 3:No battery

What they have in common

Controls / Display: Physical buttonsDisplay: Display without touch input
Both
Wallet recovery: Recovery phrase
Both

Before you choose

Consider

Coinkite COLDCARD QNeeds a compatible wallet app; follow the current COLDCARD advisory for firmware updates and migration of affected existing wallets.

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 Q

Computer

SparrowmicroSDBitcoinWindows · macOS · Linux

Connection requirements

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

SparrowQRBitcoinWindows · macOS · Linux

Connection requirements

Set up Q’s wallet in Sparrow. Q scans the unsigned transaction QR, then Sparrow uses your computer’s camera to scan the signed result from Q.

SparrowUSBBitcoinWindows · macOS · LinuxQ already set up and unlocked · USB enabled · data cable required

Connection requirements

Set up Q’s wallet in Sparrow and exchange unsigned and signed Bitcoin transaction files (PSBTs) over USB. Q must already be initialized and unlocked, with USB enabled and a data-capable USB-C cable.

iPhone · Android

NunchukNFCBitcoinSupport for wallet setup is unconfirmed

Connection requirements

Use Nunchuk on a compatible NFC phone, with an already initialized Q powered on and NFC enabled, to exchange 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: 6 · Same: 1 · Not fully recorded: 8Show details (15)Hide details

Coinkite COLDCARD QTrezor Safe 3

Display

Display type: Coinkite COLDCARD Q:LCD; Trezor Safe 3:OLED
Screen diagonal: Coinkite COLDCARD Q:Sources disagreeCoinkite lists 3.2 inches on the Q product page and 2.3 inches in its Q documentation overview. The screen diagonal remains unresolved.; Trezor Safe 3:0.96″
Resolution: Coinkite COLDCARD Q:320 × 240 px; Trezor Safe 3:128 × 64 px
Colour mode: Coinkite COLDCARD Q:Colour; Trezor Safe 3:Monochrome

Size and weight

Dimensions: Coinkite COLDCARD Q:120 × 75 × 22 mmDimensions as listed by the manufacturer; Trezor Safe 3:59 × 32 × 7.4 mmDimensions as listed by the manufacturer
Weight without batteries: Coinkite COLDCARD Q:93 g; Trezor Safe 3:Not recorded
Device weight: Coinkite COLDCARD Q:Not recorded; Trezor Safe 3:14 g

Power and charging

Replaceable cells: Coinkite COLDCARD Q:3 × AAA; Trezor Safe 3:No battery

Device connections

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

Security and software

Security chip: Coinkite COLDCARD Q:Microchip ATECC608; Maxim DS28C36B; Trezor Safe 3:CC EAL6+
Conformity marks: Coinkite COLDCARD Q:Not recorded; Trezor Safe 3:CE · RoHS