Positivo On Professor is a free Android app developed by PSD Educação for teachers of schools adopting the education systems of Editora Positivo. To access the app, users need to have a valid login and password, which can be obtained or validated by contacting their school's administration.

The app offers various features to help teachers in their daily tasks, including access to the school's academic calendar, class schedules, and student grades. Teachers can also communicate with students and parents through the app's messaging system and receive important notifications from the school administration.

Overall, Positivo On Professor is a useful tool for teachers who want to stay organized and connected with their students and school. However, it is important to note that the app can only be used by teachers from schools that have adopted the education systems of Editora Positivo.