Runs for ever
With the use of a very common replaceable Nokia BL-4C battery.
18 hours+
keycard shell
One secure device, infinite backups
Unrivalled security with an infinite number of removable Keycards, each with their own key.
Shipping December 2025 • Bundled with 2 Keycards
“Amazing piece of open-source hardware and surprisingly good UX.”
“Keycard Shell offers a unique approach to hardware wallet security with its modular design and open-source architecture.”
“Wow!”
“Impressed by how the project is thought out.”
“Revolution in hardware wallet security.”
“The wallet that doesn't spy on you.”
Unparalleled security
Keycard's secure element has passed Common Criteria EAL6+ certification.
EAL 6+Stateless
Your information and private keys are never stored on the device.
Clear security model
Your private keys will never leave Keycard's secure Element.
Fully open source
Our software, hardware and construction are fully open source.
Convenient, secure and made to last
Ethereum support
Works out of the box with your favourite Ethereum wallets.
Large display
Verify the correctness of transaction data on the secure device.
2 inchesAir-gapped
Send transactions through the air via QR code standard ERC-4527.
ERC-4527Easy to backup
Use multiple cards as backups, each protected by a unique PIN.
2 cards included with deviceBitcoin support
Works out of the box with your favourite Bitcoin wallets.
Keep your device at home
Stored away on a drawer, or hiding in plain sight, Keycard Shell is stateless without a Keycard.
Take your keys with you
Discreet and light, your Keycard fits perfectly in your wallet ready to go, everywhere!
Fully airgapped
Sign transactions on your favourite wallets through QR signing
TRANSACTION SIGNING WITH
Metamask
Ethereum
imToken
Ethereum
Rabby
Ethereum
Bitget
Ethereum, Bitcoin
UniSat
Bitcoin
Nunchuk
Bitcoin
Sparrow
Bitcoin
Specter
Bitcoin
Many use cases, multiple Keycards.
Free Card Reader (Limited Time)
