The Project Duolingo was founded in Pittsburgh by Luis von Ahn and Severin Hacker, both of whom hold doctorates in computer science. The Duolingo subscription is the paid plus version. The aim of the platform is to make further education possible for everyone. Product costs: Freemium 0€/month or as Duolingo Subscription Plus $6.99/monthĭuolingo is a freemium online service for language courses.Offering structure: Online language learning service.
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