If you are studying Japanese then you need iKanji - the most comprehensive kanji study tool available on the Mac, designed with all the care and attention you expect. iKanji contains 2230 kanji, that includes Japanese school grade kanji up to level 6 and JLPT levels 1 to 4. In addition there are 214 kanji radicals. Nearly 20,000 example words are also provided in kanji and kana with their meaning in English.
The flash card module lets you quickly browse and search for kanji, shows you animated stroke animations for many kanji as well as readings, meanings and example words.
All kanji flash cards in iKanji are freely editable and you can easily add your own too if you want to practice additional kanji.