Beware!
This app is for vocabulary only (not grammar) and limits the category word order to "alphabetical" or "shuffled" eliminating the most powerful mnemonic method available when learning to count: numerical order. Good luck starting with "billion," reaching "one" in the middle of the pack, and finding "two" toward the end...
Hotchit about
Learn Russian - AccelaStudy®, v2.5.0