Duolingo is a website where you can take courses in several languages. Each lesson uses a variety of different learning methods to help make sure the lessons stick.
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Pro Motivates through creative gamification
Progress is measured gaming-like by gaining XP, leveling up and knowing how many words are learnt. Also, lessons have a limited amount of lives, which you must preserve to pass the lesson.
They use other creative gamification techniques to keep you motivated such as making wagers and improving your position on the leaderboard.
Pro Generous free plan
Duolingo is completely free to use, with no features limited to upgraded accounts. If you want to go ad-free, the cost is $12.99/month.
Pro Engaging learning method
Each lesson uses a variety of different learning methods to keep it interesting and fun.
The lessons are short so you aren't forced to focus for long periods of time.
Duolingo is exceptionally thorough when it comes to teaching the nuances of language. It has plenty of audio material, articles to translate, and a cooperative development made by users.
Pro Has a mobile app
Pro Frequently adding new languages
Con Available languages are predominately European
Duolingo teaches 17 languages at the moment: Latin American Spanish, French, German, Italian, Portuguese, Dutch, Swedish, Irish, Turkish, Danish, Russian, Norwegian, Esperanto, Ukrainian, Polish, Welsh, and Vietnamese. Popular Asian languages such as Chinese and Japanese are not currently available (although Korean and Indonesian are in development).
Con Mobile app is less beneficial because it's too easy
Some of the games available on the mobile app are different from that on the desktop version, and are oversimplified/make it very easy to guess.
Con Little production of target language
Duolingo focuses heavily on reading comprehension and translation into one's own language rather than encouraging production of text/speech in the target language.