Keycard Pal Offline

Keycard Pal is a hardware wallet companion app. It works with a Keycard NFC smart card to sign Ethereum and Bitcoin transactions, and the key on the card never leaves it.

Requires a Keycard hardware smart card (keycard.tech). The app talks to the card over NFC: no USB, no Bluetooth.

Your wallet and Keycard Pal talk through animated QR codes. The wallet shows a request, you review it in Keycard Pal, tap your card, and show the signature back. No network connection is needed for any of it.

The phone handles key material only when you ask it to: a recovery phrase or SLIP-39 shares while you generate, import or verify them, and secrets you derive with BIP-85.

Features:
• Sign Ethereum transactions (legacy, EIP-1559, EIP-2930)
• Sign EIP-712 typed data with decoded preview before approval
• Sign personal messages (EIP-191 / SIWE)
• Sign Bitcoin transactions via PSBT
• Sign Bitcoin messages (BIP-322)
• Export wallet keys to MetaMask, Rabby, Ledger Live, Sparrow, BlueWallet, and Bitget via UR QR codes
• Generate a key pair on the card, or import a recovery phrase (BIP-39) or SLIP-39 shares
• Derive BIP-85 secrets from the card's key and show them on the phone: recovery phrases, WIF and XPRV keys, hex entropy and passwords (needs a Keycard with applet 4 or later)
• Genuine Keycard check
• No telemetry, no analytics, no account

Keycard Pal comes in two builds:
• Keycard Pal Offline (com.keycardpal.offline) has no internet permission. It cannot make a network connection.
• Keycard Pal (com.keycardpal) has the internet permission for optional features: WalletConnect, ENS names, transaction simulation with Tenderly, token images, and downloading the clear-signing descriptor registry. Each one is off until you turn it on in Settings. WalletConnect needs your own Reown Project ID and simulation needs your own Tenderly API key.

Keycard Pal is free and open-source software.

Advertisement: the Buy a Keycard links in this app are affiliate links. The developer earns a commission on purchases made through them. No app feature depends on buying through them, and every feature of the app is free.