SmartCards+ is described as 'smart flashcard system that learns what you know and remembers what you forget' and is a Flashcard Learning Tool in the Education & Reference category. There are more than 25 alternatives to SmartCards+ for a variety of platforms, including Android, Online / Web-based, iPhone, Mac and Windows. Most alternatives are Flashcard and Language Learning Tools. The best alternative is Anki, which is both free and Open Source. Other great apps like SmartCards+ are Memrise (Freemium), RemNote (Freemium), Quizlet (Freemium) and Learning with Texts (Free, Open Source).
Brilliantly simple Flashcards app Vocabulary Miner helps you learn quick and easy. With the smart algorithm you will remember the words this time. Offline learning, spaced repetition, no ads, export & import, statistics.
Kanji Book is a spaced repetition tool to study and review up to 6000 kanji with the help of interactive mnemonics. Your knowledge will be tested using multiple choice questions as well as entering translations in Japanese.