Currently only in the Android version:
Flashcard with image and audio file.
Multiple-choice flashcard.
Creating a multiple-choice flashcard.
Flashcard for which you have to type in the answer.
Flashcard with image.
Multiple flashcards.
Folder settings with speech output and countdown feature.
Settings (dark mode).
Track your progress.
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.