معدلي is an iPhone app developed by Osama Hajjar. It falls under the category of Utilities & Tools and is available for free. This app is designed to help students calculate their GPA (Grade Point Average) and improve their grades.

The main features of معدلي include the ability to easily add and remove subjects, calculate both semester and cumulative GPA, and choose between a 5-point or 4-point grading scale. The app also allows users to input grades using either the numerical scale (out of 100) or the letter scale (A, B, C, etc.).

In addition to GPA calculation, معدلي offers a grade improvement feature. Users can set their desired GPA and the app provides them with detailed information on the grades they need to achieve in order to reach their goal.

With its attractive and user-friendly design, معدلي is a useful tool for students who want to keep track of their academic performance and work towards improving their grades.