LemonSugar Ai turns a photo, typed question, or voice prompt into step-by-step tutoring—then checks whether the student actually learned it. Choose direct explanations, Socratic hints, or Feynman-style teaching in your language. Sugar remembers weak spots, builds custom quizzes, and resurfaces them before the next exam. Free forever for everyday homework; designed for learners 16+, from high school through graduate study.