handyCalc
Solve things in your hand.
handyCalc is a free Android calculator app that combines a math core with solving ability, graphing, unit conversion, and currency conversion in a single tool. It was created by a civil engineering student in Shanghai and first released in 2008.
The app includes an on-screen keypad with cubic and cubic root functions, engineering notation, bracket input, and copy-answer support. Its unit converter covers more than 600 common units, while the currency converter supports over 140 currencies with automatic exchange rate updates. Both converters include a search function and are also available as standalone apps (handyConverter and handyCurrency). The app supports Android versions from 1.0 onward, including tablet and high-resolution screen layouts.
handyCalc is distributed as a free Android app, with donations accepted to support the project.
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