Radically open. Uniquely secure.
Shell is the modular handheld that brings every Keycard to life. Slide in any card and you get an air-gapped device with a vibrant display, QR scanner, and replaceable battery - no radio attacks, no closed-source mystery silicon. Everything from the PCB to the firmware lives on GitHub under the MIT license.
Learn more at: keycard.tech/keycard-shell
Stand-out features
| Feature | Why it matters |
|---|---|
| Secure signing inside the card | Private keys never leave the secure element - ever. |
| 100 % open-source hardware & software | Crowd-audited transparency; fork or verify at will. |
| Duress PIN | Enter a decoy PIN to show a fake wallet under coercion. |
| Unlimited cards | One Shell, infinite Keycards - perfect for multi-sig, backups, family wallets. |
| Replaceable battery & USB-kill-switch | Long life, full air-gap when you need it. |
Bundle: includes 2 Keycards
Pre-order price: €99 excl. VAT (discount applies at checkout) | Ships: October 2025
Reserve yours now and unlock exclusive launch perks.