Duolingo vs. WhatsApp: Berlin startup Tandem has app that lets you chat with natives to learn a new language

 

Tandem’s video-calling-and-chat app is finally bringing the foreign pen pal concept into the digital age with over 100 tongues and 11 sign languages.

http://www.geektime.com/2017/03/05/translate-vs-duolingo-vs-whatsapp-berlin-startup-tandem-has-app-that-lets-you-chat-with-natives-to-learn-a-new-language/