Keep your decks in iCloud Drive and study them with the free Flashcard Hero iPhone app.
Drag and drop images from your Mac or any website right to your cards. Break up larger facts into lists. Use text formatting to highlight important things.
Have the answer covered, type it letter by letter, or quiz yourself with multiple choice tests. The app can also speak text on the cards in over 30 languages.
Have the app generate multiple choice tests out of your cards to test your knowledge or specify your own answer options per card.
Focus on the difficult cards and don't waste time going through cards that you already know. The app also supports the Leitner study system (similar to spaced repetition).