Notan is a free Android application developed by Tien Do Nam, designed to help students and parents efficiently manage and achieve academic success. The app is highly customizable and adaptable to any grading system, making it an essential tool for learners across the globe. While optimized for German, French, and Vietnamese students, it can be used by anyone looking for a simple and intuitive grade calculator.

One of the main features of Notan is its simple and intuitive user interface, which allows for effortless grade entry and management. Users can save and manage multiple school years or students and customize the grading system to match their educational requirements. The app also allows users to add notes and dates to specific grades for better organization and export grades as a PDF for easy sharing and printing. Notan also includes a dark mode for a comfortable user experience in any lighting condition and convenient tools for quick average grade calculation.