The best alternatives to CodeCode Ninja are Brainscape, Harken, and Brainyoo. If these 3 options don't work for you, we've listed a few more alternatives below.
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Brainscape is a web and mobile education platform that allows students to study adaptive flashcards.The world's most efficient web & mobile learning platform. Creating a smarter world by simplifying and accelerating the learning process.
Harken is a smart flashcard app that uses spaced repetition to make remembering easy. You can easily create cards with our flexible WYSIWYG editor—it supports rich text, code blocks, images, and more. Learn more in less time with Harken.
Flashcards are a great way of learning languages, but until now it was challenging to find quality decks online. That's why we built Deckmill: a repository of premium quality but affordable flashcards.