Number1 is an Android application developed by WISAM DERAR that provides educational resources for Sudanese high school and basic education students. The app is free to download and offers a wide range of subject matter explanations in the form of video tutorials and written notes.

The app is specifically designed for students of the Sudanese Secondary Certificate and Basic Education levels, with a focus on providing detailed explanations of various subjects. The app's interface is user-friendly, and the content is well-organized, making it easy for students to navigate and find the information they need. The app covers topics in various subjects, including mathematics, science, and social studies.

Overall, Number1 is an excellent educational resource for Sudanese students, providing them with access to quality educational content that can help them excel in their studies. The app is a valuable tool for both high school and basic education students, and its comprehensive coverage of various subjects makes it a must-have for anyone seeking to improve their academic performance.