App | Category | Revenue ($M) | Users (M) | Launch Date | |
---|---|---|---|---|---|
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Chegg | Education | 716 | 7.7 | December, 2007 |
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Babbel | Education | 170 | 10 | January, 2008 |
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Memrise | Education | 21.5 | 65 | September, 2008 |
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Duolingo | Education | 531 | 74 | June, 2012 |
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Busuu | Education | 50 | 140 | January, 2008 |