HiEdu Calculator: All-in-One is a free Android application that combines different calculators in one place. This versatile app has a basic calculator that performs the four fundamental arithmetic operations, square, and expression's parenthesis. It also has a scientific calculator that can find trigonometric functions, logarithms, and more.

One of the best features of HiEdu Calculator is its currency converter, which has daily updated exchange rates. The unit converter also supports length, weight, width, volume, time, temperature, pressure, speed, fuel efficiency, and the amount of data. It supports all unit conversions commonly used in everyday life.

In addition, the app has a history feature, which allows you to save your calculations and select them from the list to edit. The cursor is freely movable, making it possible to modify incorrectly entered expressions quickly and easily. Overall, HiEdu Calculator: All-in-One is a useful and convenient application for anyone who needs to perform calculations on their Android device.