Runs for ever
With the use of a very common replaceable Nokia BL-4C battery.
18+ hours
Keycard Shell
Your keys. Your rules.
The first modular, fully open-source hardware wallet. Stateless by design. Sovereign by mission.
Get the starter kit
Bundled with 2 Keycards • €135,50 €156,51
“Amazing piece of open-source hardware and surprisingly good UX.”
“[...] 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.”
Shell and Keycard are compatible with 15+ wallets
Use Keycard Shell with the wallets you already trust. Explore the full list to filter by platform and assets.
Shell: 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 Keycards includedBitcoin support
Works out of the box with your favourite Bitcoin wallets.
Verify, don't trust.
How Keycard Shell compares to legacy hardware wallets.
Feature
Shell
Keycard
Legacy hardware wallets
ETH chains and BTC
Supports Ethereum, any EVM chains (L2s), BTC, BTC multisigs
Many cards, many keys
Unlimited number of cards can be used with different keys for ease of use and backups
Card can't export private keys
Private keys can never get out of the card. The card is a secure enclave that stores private keys, and performs signatures.
Card cannot be upgraded
The card cannot be updated with new firmware
Full open source design
Hardware and software are fully open source
Use your card with other wallets
Works with various wallet applications
No vendor-specific app needed
Works without proprietary vendor software
Open and expandable ecosystem
Developers and manufacturers can build on top to grow the ecosystem and benefit from it
Compatible with 10+ wallets
Supported by more than 10 different wallet applications
Clear signing
You see what you sign before confirming a transaction
Airgap-capable
Can be used completely offline without direct connection
Camera to scan QR codes
Built-in camera for QR code-based transactions
Removable battery
Battery can be easily replaced when needed
We don't name competitors because the differences speak for themselves. All claims are verifiable on our GitHub.
See Shell in action
Many use cases, multiple Keycards.
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!