Active Dictionary is a web app for adult language learners aged 18+ at B1 level and above. Work with texts, supported videos and PDFs, explore words in context, and save vocabulary for spaced repetition. AI assistance helps connect comprehension with writing and speaking practice based on the material you study. A permanent limited free plan is available, with additional features on paid plans. AI usage limits apply. Video support depends on available captions; PDF support depends on the document.