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App lock

PIN or biometrics before anyone can open the wallet on your phone.

A second lock on the cards

Phone unlock is not always enough. CardWarden can ask for a PIN or biometrics before it shows the wallet, so handing someone your unlocked phone does not hand them every barcode and card number.

Lock is not encryption

The PIN stops a person holding the phone. Encryption stops a person holding a copy of the data. Card numbers are still encrypted on the device with ChaCha20-Poly1305 before they are stored or uploaded. The app lock does not replace the master password or the recovery phrase.

What you still need written down

Biometrics and the app PIN are convenient. They are not the recovery phrase. If you forget the master password, only that 12-word phrase can unwrap the vault. The app lock cannot.

CardWarden lock screen asking for a PIN or biometrics

More of the wallet

Recovery Phrase

A 12-word phrase that can unlock your vault if you forget your password.

Zero-knowledge encryption

Cards are encrypted on your device. The server only stores ciphertext.

Single card share

Send one card with a passphrase, or a QR code when the person is beside you.

Family sharing

One Premium Family subscription, shared pockets, and cards that stay in sync.

Multi-device sync

The same encrypted wallet on your phones, tablets, and watches.

Tablets and foldables

The same wallet, laid out for a wider screen.

Offline checkout

Show barcodes without signal. Edits queue until you are back online.

Credit card manager

Log transactions, get due-date reminders, and see a statement balance.

Watch and widgets

Apple Watch, Wear OS, and home screen widgets for the cards you use most.

Gift card balances

Log what is left, check with the retailer, and keep the household on the same number.

Common questions

Can I use Face ID or a fingerprint?

Yes. CardWarden can lock behind biometrics or a PIN.

Is the PIN my encryption password?

No. The PIN or biometric check opens the app on that device. The master password and recovery phrase unwrap the encryption key.

What if someone steals the phone?

The lock blocks casual access. Encryption means a copy of stored data is still ciphertext without your password or recovery phrase.

Where is the encryption explained?

On the zero-knowledge encryption page, and in full in the security white paper.

Hand over your phone. Keep your cards.

Download CardWarden and open the wallet only when you mean to, not whenever the phone is already unlocked.