Duolingo

Duolingo is a learning platform that teaches through short app based lessons. Language courses are the original and still the largest part of the catalog, and the company has since added chess, math and music as separate subjects carried in the same app and covered in parallel on the company blog, which describes itself as writing about the best way to learn a language. Around the consumer app sits a small product family. Super Duolingo is the paid tier of the main app. The Duolingo English Test is a separate English proficiency exam sold in its own right. Duolingo for Business addresses organizational use, and there is a merchandise store alongside. The apps run on desktop, Android and iOS. The company publishes a steady stream of practical teaching posts next to the courses themselves, covering material such as Spanish phrases for travel and English nationalities on the language side, and piece movement, en passant and stalemate on the chess side, which gives a fair indication of the level the lessons pitch at. No pricing could be read from Duolingo's own site. Every page checked, including the home page, the Super Duolingo page and the efficacy page, renders its content entirely in JavaScript and returns no readable text, so neither the limits of the free tier nor the price of Super Duolingo could be verified from the vendor's pages. Prices appear in the apps and at checkout instead. This entry is also filed in the registry under productivity tools, although the product is primarily an education one.