Wikipedia
LinguaLeo
Lingualeo is a freemium online platform offering an English language learning service for Russian, Brazilian Portuguese, and Turkish speakers. As of December 2015, over 13 million people worldwide have used its online service to learn English. Lingualeo is available on the web, Android, iOS, Windows Phone, and as a browser extension. In November 2010, the company raised $200,000 in funding from angel investors, and in June 2012 LinguaLeo received $3 million from Runa Capital.