CardJar

Overview

CardJar is a modern, privacy-focused loyalty card app designed to store all your retail cards on your phone without requiring accounts, sign-ups, or email addresses. Supporting over 500 loyalty schemes across 12 countries, the application operates completely offline and ensures that your personal shopping data never leaves your device.

Key Features

• Zero Account Required: Completely free with no sign-ups, tracking, or advertisements.
• Offline Functionality: Works entirely without a data signal, Wi-Fi, or in aeroplane mode.
• Fast Access at the Till: Automatically displays bright, scannable barcodes with a single tap.
• Wear OS Integration: Access your favorite cards directly from your smartwatch.
• Batch Import: Quickly import screenshots from apps like Stocard without uploading data.

Use Cases

• Managing multiple retail and supermarket loyalty cards in a single, lightweight digital wallet.
• Quickly scanning barcodes at checkout counters even in basement stores with no cellular signal.
• Sharing loyalty cards securely with family members via direct links without a shared account.

Pricing

CardJar is 100% free to use with no hidden catches, premium subscriptions, or monetization via data tracking.

FAQ

How do I add my loyalty cards?

Scan the barcode on the back of each card using your phone camera, or manually type in the number if the barcode is damaged.

Does CardJar send my data anywhere?

No. The app makes zero network requests. All shop lists, logos, and card data are stored locally on your device.

Does it work without an internet connection?

Yes. Because all data is stored locally, CardJar works completely offline and in aeroplane mode.

Can I use CardJar on my smartwatch?

Yes, CardJar supports Wear OS, allowing you to access your favorite loyalty cards directly from your wrist.

What happens if I switch to a new phone?

Your cards transfer seamlessly with your phone's standard backup system, or you can export all cards into a single passphrase-protected file.