Duolingo by Duolingo is an application that was designed for mobile phones to help you learn various foreign languages. Unfortunately, Duolingo for Mac is not available as a standalone app, so if you don't want to use the Web-version of the service, feel free to try one of the Mac apps for foreign language learners we've found. Here is a list of alternatives to Duolingo for Mac.
Feel free to add any alternative to Duolingo for Mac that you know of.
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Duolingo has a Mac OS app now