AlterCard

AlterCard — a minimalist loyalty card wallet, nothing extra.
Scan a barcode once — your card is always at hand, right on your phone screen.

Features:

Barcode Scanner
Instant recognition via camera or from a photo in your gallery.

Display at Checkout
The app generates a barcode on screen — just show it to the cashier.

Google Drive Sync
Your cards are backed up to Google Drive. When you switch phones, everything
restores automatically.

Manual Entry
No barcode? Enter the number manually and the app will generate a Code 128.

Personalization
Customize the card color to match the store logo using an HSV color picker.

Dark Theme
System dark theme support with Material Design 3.

Supported barcode formats:
QR Code, EAN-13, EAN-8, UPC-A, UPC-E, Code 128, Code 39, Code 93,
CODABAR, Data Matrix, Aztec, PDF417, ITF.

Privacy:
Sync uses Google Drive's private storage (appDataFolder).
Your data is visible only to you and is never shared with third parties.