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Pro Can be used on old devices (requires Android 2.3.3)
Pro Small file size
Comes in at only 866KB.
Pro No ads
Pro Studycards Online: create and share flashcards in the marketplace
Studycards Online allows you to create flashcards on your desktop computer and synchronize them with the app. You can also share your stack with other users.
Con Free version allows only 20 cards per stack
If you want to create stacks with no card limit you have to upgrade to the premium version.