Calculator ++

Calculator++, cataloged maintained by independent developer Sergey Solovyev, is an advanced computational engine built for scientific, algebraic, and engineering workflows. Designed to surpass standard mobile utilities, Calculator++ combines deep symbolic mathematics, calculus solvers, and multi-dimensional graphing into an open-source mobile application.

The interface is driven by an intuitive gesture-based interaction model. Rather than requiring multiple shift keys or sub-menus to access secondary operations, Calculator++ displays auxiliary mathematical functions directly along the upper and lower edges of each keycap. By executing a simple upward or downward slide across a button, the user invokes the corresponding function instantly. For example, sliding up on the division key activates percentage calculations without changing the active screen. In addition, the calculation parser operates in real-time, computing and displaying valid mathematical results as characters are entered, removing the need to tap an equals key for intermediate steps.

Beyond standard scientific formulas, Calculator++ includes an integrated graphing engine capable of rendering 2D functions on Cartesian and polar planes, as well as 3D surface meshes that can be rotated in real-time. The application supports complex numbers, algebraic fractions, matrix components, and symbolic differentiation and integration. Users can also create custom constants and functions, streamlining repetitive professional and academic calculations.

For technical multitasking, Calculator++ features a dedicated floating window mode. This lets the full computational workspace float over technical reference PDFs, coding environments, or web browsers, eliminating the need to switch apps during complex calculations. While the specialized interface requires a brief adjustment period, its depth of features makes it an indispensable tool for students, researchers, and engineers.