코리노트s is a free Android app developed by luckydna, designed to make note-taking and memorizing easier for students and professionals. The app allows users to easily create and organize their notes on a mobile device, and review and memorize them later. The app's design is simple and easy to operate, with a focus on the most essential functions for studying. Users can even enter data by organizing it with Excel on a computer and moving it to mobile. The app also features a self-memorization checking function, which allows users to filter content and review only what they need to. Corynote is recommended for anyone who is preparing for a certificate, working professionals, or students who need help memorizing everyday information. The app is available for both Android and iPhone.