★ Convenient and smart calculator with built-in function that can use various calculator in one app and prevent user's mistake as much as possible ★ History, memory storage function, Undo, Redo function ★ Supports 7 different calculator themes ★ Calculator button sound and font change function - Integrated calculator configuration - 1) Simple Calculator 1) General Calculator 2) Engineering Calculator 3) Statistical calculator 4) Precision Calculator 5) Date Calculator 6) Unit conversion 7) Percent Calculator 8) Interest calculator (deposit / savings / loan)