A Qibla direction app is a mobile application that helps Muslims determine the direction of the Qibla, which is the direction of the Kaaba in Mecca, Saudi Arabia. Muslims around the world face towards the Qibla during their daily prayers, and the Qibla direction app helps them to find the correct direction no matter where they are.

Qibla direction apps use a smartphone's GPS, compass, and other sensors to determine the user's location and calculate the direction of the Qibla from their current position. The app displays the Qibla direction as an arrow or a compass, and some apps may also include additional features such as prayer times, Islamic calendars, and Islamic guidance.

A simple calculator app is a mobile application that provides basic arithmetic calculations, such as addition, subtraction, multiplication, and division. These apps are designed to be easy to use and provide quick and accurate calculations for users.

Most simple calculator apps have a user-friendly interface with a numeric keypad and basic arithmetic operators. Users can input numbers using the keypad and perform calculations by tapping the appropriate operators. The app then displays the result of the calculation on the screen.