Active Dictionary

Active Dictionary is a freemium web app for independent language learners at B1 and above. Study texts, supported PDFs and captioned YouTube videos, save contextual vocabulary to a personal dictionary, review it with spaced repetition, and use AI assistance with speaking and writing practice. Public library materials require no signup; personal features require an account. A permanent limited free plan is available, with paid plans starting at $9/month. YouTube captions are required, PDF compatibility depends on the document, and AI usage limits apply. Public demo: https://activedictionary.com/library?tab=public.