In addition to more than 40 languages—from English, French, and Spanish to less frequently studied languages like Welsh, Irish, and Swahili—Duolingo also provides courses in maths, music, and other subjects. Additional offerings include the kid-friendly literacy software Duolingo ABC and the online certification programme Duolingo English Test. The business operates on a freemium business model; Super Duolingo, an optional premium subscription, has more features and is ad-free.
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