EddyStudy for iPhone is a powerful tool to build your vocabulary or to memorize and study anything.
Flashcard with image and audio file.
Creating a multiple-choice flashcard.
Flashcard for which you have to type in the answer.
Flashcard with image.
Folder settings with speech output and countdown feature.
Multiple-choice flashcard (dark mode).
Track your progress.
Settings (dark mode).
You can create up to 50 flashcards with the free version of the app.
Other than that there are no limitations.
If more flashcards are needed you can unlock the pro version for a small one-time-payment of $2.99.
from within the app. After that you can forever create an unlimited number of flashcards.