It’s optional but strongly recommended. Our decks save hours and dramatically improve retention. Anki is free, ad-free software that is available for all major operating systems and mobile platforms, so you can use it on your phone, tablet, or computer.
Anki’s spaced repetition system helps you internalize key vocabulary from our stories as quickly as possible, without wasting time on words and phrases you already know.
Important: Be sure to download one of the official Anki apps. There are many imitators that charge a fee or inundate you with ads, and they are no better than the real deal.