Manage your custom cards in the most easy way that you can imagine. Nearly no permissions required. Reduced to it's real core functions and also completely offline. Scan and/or enter your barcode and/or make pictures of your card. From now you can use it directly from this application. No need to search in your pocket/wallet for your cards anymore. Intuitive in use. Easy backup/sync feature, just send the backup file to your family, with email or whatever. Without social media integration, without advertisment or "shopping tips". An app for you and your family, that's it. No data will be transfered to any server, it's offline, point.
There is also a free version of this application. It have a few features not included (No pictures) but in general, it's the same.
Information to permissions:
Contacts/Identities -> Is optional when you do a backup export. You can send it directly via E-Mail.
Camera/Pictures/Media/Storage -> Required to store card data and pictures.