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Duolingo Inc. [b] is an American educational technology company that produces learning apps and provides language certification.Duolingo offers courses on 43 languages, [5] ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo, and even constructed languages such as Klingon. [6]
This list is limited to programs that teach four or more languages. There are many others that teach one language. Alphabetical lists of languages show the courses available to learn each language, at All Language Resources, Lang1234, Martindale's Language Center, Omniglot, and Rüdiger Köppe.
Duolingo's expanding language repertoire might just help you with a trip to the Middle East. The service now offers a course that teaches Arabic to English speakers -- specifically, a ...
On May 28, 2015, the language learning platform Duolingo launched a free Esperanto course for English speakers. [64] On March 25, 2016, when the first Duolingo Esperanto course completed its beta-testing phase, that course had 350,000 people registered to learn Esperanto through the medium of English.
In 2012, a study by American universities showed that spending 34 hours of learning on Duolingo was equivalent to a full-semester of a college language course. In 2015, Hacker and von Ahn started selling translations, such as to the Spanish tech news group of CNN.
The Duolingo English Test (DET) is a standardized test of the English language designed to be internet-based rather than paper-based. DET is an adaptive test that uses an algorithm to adapt the difficulty of the test to the test-taker.