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What is Duolingo's business model?

I assume this website is created and run for profit. But i don't really see how. Where is the money coming from, how do they monetize users? I've not been asked to buy anything, or sign up for anything.

I'm perplexed.

June 29, 2015


[deactivated user]

    Previously, they used Imerssion. Companies would pay Duolingo to have their users (us) translate documents into other languages for them.

    Thye also use the Test Center, where people can pay 20 dollars for an online Englsih fluency test. Previously, these tests in other places could cost upwards of 200 dollars.


    They also run lots of A/B tests on various motivating factors and their affects on language learning and the results will have an academic value. Also they have recently received various substantial grants.

    Learn a language in just 5 minutes a day. For free.