Tieng Anh Lop 4 - English 4 T1 is an educational app developed by Tracy Duong. It is an interactive platform that simulates the listening exercises from the English textbook for fourth-grade students by the Ministry of Education and Training.

One of the best features of this app is that students can use it offline, making it a convenient tool for learning English anytime, anywhere. The app offers clear and easy-to-understand audio for each lesson, making it easier for students to listen and learn. Teachers can also use the app on their mobile devices or tablets to teach directly in the classroom.