Here are ten of the best language learning apps for 2015, updated to include those with social dynamics, like HelloTalk, recent entries like Rosetta Stone, and stalwart Duolingo. We’ve also made an effort to include multiple languages, including Mandarin, French, Spanish, and English.
http://www.teachthought.com/apps-2/best-language-learning-apps-2015-ipad-learn-english/