A MOMENT OF FRICTION

The moment we need to calculate something, we pause—not to think about the numbers, but to decide which app to open.
More often than not, the friction lies not in the calculation itself, but in the choices we must make before we even begin.

All in One Calculator started from this recurring hesitation.
Regardless of country, language, or usage context, the app was designed around the idea that calculation should follow a single, intuitive flow—accessible to anyone, anywhere.

One Interface, Anywhere

The interface does not rely on culture-specific habits or localized conventions.
Instead, its structure is built around universally understood elements—numbers, units, and input behaviors—allowing users across the world to navigate the same screens in the same way.

Even when languages or measurement systems differ, users perform the same actions in the same places to reach their results.
The goal was simple: ensure that the act of calculating never stalls at the step of interpreting the interface.

Designed for Immediate Use

From basic arithmetic and unit conversion to BMI, currency exchange, and VAT calculations,
all essential functions are clearly organized within a single screen.

Without lengthy explanations, users can understand each tool through icons and layout alone.
The flow—input → confirmation → result—is kept intentionally minimal.
Whether opened for the first time or used daily, the app is designed to be immediately usable, wherever and whenever it’s needed.