RunMath

Keyboard-first Windows calculator opened by a global hotkey, with history and unit conversion

Desktopfree

RunMath is a free, open-source calculator for Windows designed around the keyboard: a global shortcut brings it up, and results can be copied or stored in a history without touching the mouse. It handles arithmetic, roots, factorials, complex numbers and unit conversion, and works entirely offline. It suits people who want a quick calculation without breaking their flow.

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