Vocabulary trainer needed - sync across devices
I'm looking for recommendations. I need a new vocabulary trainer. I am currently using viaverbi (a program I like very much but which is unfortunately outdated).
There are a few features I am looking for:
- it should schedule the repetition of the words automatically and according to my performance
- runs on MacOS
- can be synced across devices (preferably iOS, MacOS, Windows, and Android)
- lets me choose if an answer was correct or not
- lets me add my own vocabulary (not a 'learn the 1000 most common words' application)
Thank you very much for any help/recommendation!