. . . "Duolingo /\u02C8dju\u02D0\u0275\u02CCl\u026A\u014B\u0261o\u028A/ is a free language-learning platform that includes a language-learning website and app along with a crowdsourced text translation platform and a language proficiency assessment center. Duolingo is ad-free and offers all its language courses gratis. The language-learning website and app offer over 40 different language courses across 23 languages. The app is available on iOS, Android and Windows 8 and 10 platforms with over 100 million registered users across the world."@en . . "Duolingo"@en . .