Duolingo vs OpenKoto

Duolingo offers learning in languages, chess and math through short lessons that adapt to a learner’s level and pace. Language practice covers reading, writing, listening and speaking, with speech exercises, personalized review, offline lessons and a placement test among the listed tools. Challenges, reminders and game-like features provide ways to structure practice. Duolingo says its teaching methods are research-backed and aimed at real-world communication skills. It lists 40 languages and is available on Android, iOS, macOS and the web. The pricing note includes a free plan and a 14-day trial. Other listed products include the Duolingo English Test, Duolingo for Business, Duolingo for Schools, Super Duolingo and Duolingo Max. The English Test is described as AI-enabled and intended to be taken wherever and whenever users perform best. FAQs and service status information are available. Duolingo was founded in 2011 and is headquartered in Pittsburgh, Pennsylvania.

OpenKoto is a language-learning app for turning content you choose into reading and study material. It imports URLs and PDF, EPUB, TXT, Word, and Markdown files, then provides automatic translation and vocabulary extraction. In the reader, learners can switch languages in real time, look up words, and parse grammar. An AI assistant offers contextual word explanations, grammar breakdowns, pronunciation guidance, and questions about highlighted text. The app supports learning and transcription in more than 100 languages, including Japanese, English, Chinese, Korean, French, German, Spanish, Italian, and Portuguese. The maker also describes video learning with synchronized subtitles and transcription. Desktop downloads are listed for Mac, Windows, and Linux; native iPhone and iPad apps include offline-first use, vocabulary review, and video subtitles. The maker says desktop data is processed locally and iOS learning data stays on the device, with API keys in the iOS Keychain. OpenKoto is free and open source under Apache 2.0. Its web version is being rebuilt, with vocabulary review, novels, and lyrics planned to sync across platforms.