QANDA is a free Android app developed by Mathpresso that offers a solution to tricky homework, assignments, and exam preparation. The app claims to solve your doubts in just five seconds by snapping a picture, and it's chosen by over 65 million elementary, middle, and high school students from 50+ countries. QANDA offers step-by-step solutions with a graph, from basic math to calculus, and you can even ask top-school tutors for help and get solutions within minutes. The app covers several math topics, including arithmetic, algebra, trigonometry, calculus, and statistics. QANDA also offers web search resources, videos, and step-by-step explanations. The app is available in English, Spanish, Korean, Japanese, Vietnamese, Indonesian, and Thai.