It's said that nothing good comes for free. But the globally-acknowledged app, DuoLingo proves the theory wrong. Known for its unique gamification approach to language learning, DuoLingo, is now available in Hindi for those who are keen to learn the English language. What it means is that anyone with access to an Android phone and a basic knowledge of the English alphabet can master the language on their phone. You can also use the app to master 17 other international languages.