Good, but could be better

The Flashcard feature is very good, but freezes often (in Czech & other languages). This is very annoying. I hope the bug will be fixed.
It also seems to be designed to repeat essential basic words more often, and that is also good in theory, but tedious in practice. It ought to eliminate learned cards at some point or have a "Do not repeat this card" option.
The voices, vocabulary choices, and visual appearance are very good overall. I just hope the bug(s) will be fixed.

Culture Warrior about Czech by Nemo, v3.2.5