I want to learn Ukrainian, but I need a tool to learn the Ukrainian alphabet before I get started with Duolingo's Ukrainian course.
Anki(droid) is a flashcard program, which has user-created decks. There seem to be decks for Ukrainian alphabet: https://ankiweb.net/shared/decks/Ukrainian (one general, one for vovels, one for consonants). I have not used them.
I have used Anki decks to more-or-less learn Japanese hirakana and katakana to the extent that I can pronounce words written in them. I stopped studying the language further, but when I did also study it via Duolingo, the initial exercises with kana were terribly easy. I guess it should work for Ukrainian, too.