Great Concept, Lousy User Interface
Originally a great concept: storing loyalty card numbers on my iPhone. Tieing card access to cloud "services" is a monumental fail.
Updating iOS causes the app to sign itself out of the cloud. This results in an attempt to remember the email address and password used for the CardStar cloud while watching my groceries being scanned. Paying 20% more for a cart of groceries because I cant present my loyalty card: priceless.
Esfrank about
CardStar, v5.0.4