The best alternatives to Sow Chrome are Anki, Vocabulary Builder, and New Tab Quizlet. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Sow Chrome?
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New Tab Quizlet is a Chrome extension that displays a Quizlet card on every new tab you open. An interesting experiment to integrate spaced learning inside something we do every day.