عمر الشاك is a free check writing app developed by HSystème for Android users. The app allows users to write checks in both Arabic and French languages without any spelling errors. It also helps users to improve their handwriting skills. The app has a simple and user-friendly interface, making it easy for users to navigate and use.

One of the main features of عمر الشاك is its ability to write checks with both numbers and letters, making it a very useful tool for users who need to write checks in both languages. The app also checks for spelling errors and provides suggestions for corrections. The app is a great utility tool for anyone who needs to write checks in Arabic and French without errors, and it is available for free on the Google Play Store.