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?
Hurree— The smarter, simpler way to analyze your data
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.