Existing certification programs, such as the Test of English as a Foreign Language, can cost hundreds of dollars. Duolingo's will cost $20.
Duolingo, the startup that aims to translate the web, said it will offer an English language-proficiency test starting May 13 that will be administered over Android smartphones for $20. To help the test gain broad acceptance, the translation startup said it will partner with Google at launch to recognize the certification. Duolingo plans to offer certificates in other languages later this summer, a representative told Fast Company.