It's adequate, but you'd be better off with another app. – Flashcards* Review

This app does the job — mostly. It's easy to set up a flashcard deck, but other problems exist. Whenever you edit the deck in any way — fixing the spelling, adding a card, editing the title — all the starred cards disappear. For students like me, who can have 75+ cards in one deck, this is a problem. Customer service also is lacking; if I send emails about problems to their help staff, I usually get an automated reply and then nothing, or at least nothing of substance. Ad placement will make you click on ads — that's their bread and butter, I guess, and you can always pay for the option to not have any ads, but it is still distracting.
Review by A17B on Flashcards*.