Keycard Shell
Open source and air-gapped hardware wallet to use with multiple Keycards
Each Keycard is a unique wallet with its own mnemonic words. Switch cards in seconds. Convenient, modular and secure.
Bundled with 2 Keycards • €135,50 €156,51
Insert a Keycard. Get an air-gapped hardware wallet.
Shell signs by showing your computer a QR code. It never connects to it, and it holds nothing once the card is out.
- Air-gapped
- Open source
- Works with 15+ software wallets
- Comes with two Keycards included
Or use your Keycard with your phone or computer
The Keycard is a hardware wallet by itself. The secure element is in the card and your keys never leave it — no Shell needed, no battery, nothing to charge. One card is one wallet, so swapping cards switches wallets in seconds.
-
With your phone
Tap the card on the back of your phone to sign over NFC. Nothing to plug in, nothing to pair. Works with Status on mobile.
-
With your desktop
Slot the card into the USB reader and sign from your computer. Works with Status Desktop and Sparrow.
Every hardware wallet is a black box. Ours is not.
Keycard and Shell are designed to be maximally trustless. Every line of code is verifiable in the open, on our GitHub.
The keys
Legacy wallets
Bound to one device and one only. Recovery means a paper seed.
Keycard Shell
Live on a swappable smartcard. Back them up on more cards, carry them in your wallet, use them with any Shell, or any compatible wallets. Your keys, your control.
The code
Legacy wallets
At best: partly open source.
Keycard Shell
Maximally permissive open source: firmware and card applets are MIT licensed. Full hardware is CERN-OHL-S v2.
The rules
Legacy wallets
The signing part of the device is remotely upgradable. How your keys can be used or extracted may change after you buy, with an update you did not choose.
Keycard Shell
The card's software is sealed and cannot be updated. The rules for your keys never change. Not even by us.
The lock-in
Legacy wallets
One companion app, working the way their business model needs.
Keycard Shell
Works with 15+ independent wallets through open standards. Pick your wallet, change it any time.
Works with the software wallet you already use
Keycard signs through QR code open standards and is compatible with a growing ecosystem of 15+ wallets across Ethereum and Bitcoin. See all supported wallets.
FAQ
What is the difference between Keycard and Keycard Shell?
Keycard is the secure smart card that stores your private keys. You can use it directly with compatible software wallets on mobile (NFC), on desktop (with a USB smart card reader), or together with Keycard Shell as an air-gapped hardware wallet with a secure display.
Keycard Shell is the companion signing device with a screen and keypad. It works with 15+ software wallets (mobile, desktop, and browser extensions) and uses Keycard as the secure element.
When you purchase a Shell, two Keycards are included.
Which blockchains do Keycard and Keycard Shell support?
Keycard and Keycard Shell support Ethereum, all EVM-based blockchains, and Bitcoin.
Can Keycard and Keycard Shell be used independently?
Yes, Keycard can be used without Shell with mobile wallets (through NFC contactless taps) or desktop wallets (with a USB reader).
You can check the list of compatible wallets on the dedicated page (filter wallets with the “Keycard” compatibility filter).
No, Keycard Shell cannot be used without a Keycard.
How many wallets can I use on one Keycard?
One Keycard holds one master key (which is the equivalent of your list of mnemonic words) and generates as many Ethereum and Bitcoin wallet addresses as you need, according to the BIP32 standard.
Keycard
A card shaped hardware wallet
Store your crypto in a simple, secure and slim hardware wallet.
From €25
Keycard Shell
A modular air-gapped hardware wallet
The only open source hardware wallet for Bitcoin and Ethereum with fully open design.
Bundled with 2 Keycards • €135,50 €156,51
About Keycard
Keycard builds open-source, air-gapped hardware wallets for self-custody of Bitcoin, Ethereum, and EVM-compatible chains. The modular Keycard and Keycard Shell use a non-upgradable EAL6+ secure element with NFC and QR (ERC-4527) signing, and work with MetaMask, Status, Rabby, imToken, BitGet, Unisat, Specter, Sparrow, Nunchuk, BlueWallet, Bitcoin Safe, Cove, Bull Bitcoin, and Ambire. Both are MIT-licensed public goods, free to fork, audit and build on. We explain why in the Keycard manifesto.