Crazy English

Fun, unconventional lessons turn everyday situations into engaging opportunities to practice and improve fluency

Bilingual English-Vietnamese dictionary with offline access, pronunciation guides, and example sentences

Crowdsourced audio pronunciations from native speakers help you master words in hundreds of languages

Adaptive K-5 literacy program offering personalized lessons and actionable teacher insights aligned with Common Core

Crowdsourced homework help platform connecting students worldwide with fast, community-powered answers and explanations

Stay in the know about new research papers and share them with others easily

Access interactive tech courses, career-ready nanodegrees, and flexible learning paths directly on your device