Graphmatica

Graphmatica is a math application that lets you create graphics for functions in the cartesian plane, inequalities, ordinary functions, and differential equations.

The app supports up to 999 graphics at the same time, and can easily show trigonometric functions and integrals. It is really easy to use, letting you quickly spot critical points, and solutions for intersections between functions.

Once you are done working with an equation or a function, you can print the result and work with it on paper, or export it to BMP format to keep working digitally.

Graphmatica is a math application that, despite being easy to use, features pretty sophisticated software that few users can benefit from. However here are many tutorials and FAQs on the creator's website for those who encounter any problems using the application.