Mnemo is a flashcard app for iPhone that opens the decks you made in Anki. Study by swiping, or hands-free with the screen locked: Mnemo reads each card aloud, listens for your answer and reads the answer back.
It schedules cards with FSRS or SM-2, the schedulers Anki uses. You can study from a Home Screen widget, add a card by telling Siri a fact, and get a memory aid for a card that won't stick.
No ads, no accounts, no tracking. Your cards are kept on your iPhone, not on a Mnemo server.