I like the app Anki (Anki is a free and open-source spaced repetition flashcard program).
But the web version is very limited.
For example you can't delete cards.
I search an alternative web interface for the cards I have in Anki.
- Needs to sync with Anki on Android
- cheap (less than 12$ per year)
- deleting cards
- A way to search over all decks (not just in one deck)
- search by tag
- changing the deck of a card should be possible (on edit, not just on "add")