Grapher Pro - Equation Plotter

Basile Van Hoorick

About this app

Grapher Pro is a fast and effective equation plotter, capable of drawing any function (including complex-valued ones), solving equations and calculating expressions. Especially if you're a student, teacher or engineer, this app is made with you in mind! A wide range of predefined functions is available, including trigonometric & hyperbolic functions, polar coordinates, differentiation and more. Anything you type will be processed and displayed instantly by a powerful math engine, in both 2D and 3D modes. Furthermore, functions can reference each other and variable sliders allow for efficient visualization.

As I strive to make Grapher fit your needs, any feedback and bug-reports are greatly appreciated!

Pro version features
• Full support for complex 2D functions (i.e. plot a real + imaginary part), complex plane parametric plots and domain coloring
• Variable sliders: adjust parameters to see their effect in real-time
• Choice between light and dark theme

Curve types
• Function (e.g. parabola, sine wave)
• Polar (e.g. rose, spiral)
• Parametric (e.g. ellipse, Lissajous) on the xy-plane, rθ-plane or complex plane
• Implicit equation (e.g. conic sections)
• Implicit inequality (e.g. half-plane)
• Complex domain coloring (e.g. Riemann zeta)
• 3D function (e.g. paraboloid)
• 3D parametric curve (e.g. helix)
• 3D parametric surface (e.g. sphere, hyperboloid)

More features
• Equation solver (numerical)
• Find roots, extrema and intersections with other functions
• Complex number support
• Real-time variable sliders
• Functions can reference each other, e.g. g(x)=2*f(x+1)
• Custom math keyboard
• Auto-detect input type
• User variable support for both numbers and functions
• Adjustable parameter range (for cartesian, polar & parametric curves)
• Input history
• Plot up to 28 graphs at once
• Light and dark theme
• Differentiation (numerical)
• Trace graph
• Capture screenshots

Note: Mathematical functions should be typed by their names, for example sqrt(x) means √x. Hold a key to see all function names starting with that letter. If something is unclear, be sure to check out the 'Help' page as all details are summarized there.

Ratings and reviews

This tool has been actively used for about the last 4 years. It's an incredibly powerful calculator, to say the least. Any limitations I've identified in the app are most likely "non standard" topics best suited for a programming language of choice. One such example of a limitation is that the app is not geared for working with discrete or quantized data, or functions, very efficiently. It'd be nice to be able to plot a cluster of user definable points to do statistics on, or plot discrete pdfs.

I like it a lot for the things I want and it's reliable, but there are lots of irritating missing features. I bought the upgrade because I appreciate this app in particular for its easy to use 3d plotting. I'd love if it was on GitHub and I could contribute, though! I want to add ease of use features around saved functions and add more built-in functions.

Expression text boxes are too short. Need to allow longer expressions, maybe 65,536 characters. Any time I put in an expression, it gets rejected because it's too long. Also, Copy/Cut/Paste doesn't work very well ... sometimes not at all. Also allow custom ordering of expressions ... not some random order.

What's new

• Added absolute value '|' key
• Custom keyboard bugfix
• Licensing verification crash fix