How Duolingo A/B Tested Their Way into a $6.4 Billion Worth With Its Freemium Model

[syndiseok]

@preacherbob Hey? I have already shared the site list with you now. Can you please respond?

 

[naiduindia]

@evangelisticseverline Great post.

 

[breinicke]

@evangelisticseverline this is awesome
thanks for sharing

 

[longsearching1]

@evangelisticseverline I still like Rosetta Stone more than Duolingo