He had a desire to create something that would help the educational sector after selling his company, reCAPTCHA, to Google. The app was developed as a project at Carnegie Mellon University by Professor Luis Von Ahn and his student, Severin Hacker in 2009. It has both a free version and a paid version, but using just the free version is sufficient to gain a degree of fluency in a language. Due to its fun and lively design and interactive method of learning, Duolingo has grown to be the most popular language-learning application.
It was the very first language learning app to provide results that rivaled expensive language courses and programs. Duolingo is a free language learning application.
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