iPhone · Nunchuk · NFC · BitcoinSupport for wallet setup is unconfirmed
Ledger Flex:
✓
BluetoothLedger Wallet · Bitcoin / Ethereum
Set up the wallet
Coinkite COLDCARD Q:
?Support for wallet setup is unconfirmed
Ledger Flex:
✓
BluetoothLedger Wallet · Bitcoin / Ethereum
Approve transactions
Computer
Coinkite COLDCARD Q:
✓
microSDSparrow · Bitcoin
✓
QRSparrow · Bitcoin
✓
USBSparrow · BitcoinQ already set up and unlocked · USB enabled · data cable required
Ledger Flex:
✓
USBLedger Wallet · Bitcoin / Ethereum
Android
Coinkite COLDCARD Q:
✓
NFCNunchuk · Bitcoin
Android · Nunchuk · NFC · BitcoinSupport for wallet setup is unconfirmed
Ledger Flex:
✓
USB · BluetoothLedger Wallet · Bitcoin / Ethereum
Where they differ
Cryptocurrencies
Coinkite COLDCARD Q:Bitcoin-only
Ledger Flex:Multiple cryptocurrencies
Controls / Display
Coinkite COLDCARD Q:Physical buttonsDisplay: Display without touch input
Ledger Flex:Touchscreen
Battery
Coinkite COLDCARD Q:Replaceable batteries
Ledger Flex:Rechargeable
What they have in common
Wallet recovery
Recovery phrase
Both
Not fully confirmed
Operating power
Coinkite COLDCARD Q:Batteries or USB power
Ledger Flex:Not recorded
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.
Ledger FlexiPhone connects by Bluetooth. Android connects by USB or Bluetooth. NFC does not replace USB or Bluetooth for ordinary transactions. Cryptocurrency support depends on the app.
Apps and requirements
Show detailsHide details
Connectivity
Coinkite COLDCARD Q
iPhone · Android
NunchukNFCBitcoinSupport for wallet setup is unconfirmedConnection requirements
Use Nunchuk on a compatible NFC phone, with an already initialized Q powered on and NFC enabled, to exchange Bitcoin transaction files (PSBTs).
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 requiredConnection 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.
Ledger Flex
iPhone
Ledger WalletBluetoothBitcoin / Ethereum
Computer
Ledger WalletUSBBitcoin / EthereumWindows · macOS · Linux
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.
Ledger Flex:2.8″
Resolution
Coinkite COLDCARD Q:320 × 240 px
Ledger Flex:480 × 600 px
Colour mode
Coinkite COLDCARD Q:Colour
Ledger Flex:Grayscale
Shades of grey
Coinkite COLDCARD Q:Not recorded
Ledger Flex:16
Size and weight
Dimensions
Coinkite COLDCARD Q:120 × 75 × 22 mmDimensions as listed by the manufacturer
Ledger Flex:78.4 × 56.5 × 7.7 mmDimensions as listed by the manufacturer
Weight without batteries
Coinkite COLDCARD Q:93 g
Ledger Flex:Not recorded
Device weight
Coinkite COLDCARD Q:Not recorded
Ledger Flex:57.5 g
Power and charging
Replaceable cells
Coinkite COLDCARD Q:3 × AAA
Ledger Flex:Not recorded
Battery life
Coinkite COLDCARD Q:Not recorded
Ledger Flex:Up to 10 hrUsage conditions not stated
