Quizsis turns a topic, notes, a PDF or slide deck, a photo, a web page or a YouTube video into a ready-to-solve quiz in seconds. 7 question types, AI grading, flashcards with spaced repetition, game modes, LMS export, 75+ languages. Free on web, iOS & Android. Teachers share a link and students solve it instantly - no sign-up needed - or use invite-only student links to see who answered.