Graphmatica is a graphing program created by Keith Hertzer,[1] a graduate of the University of California, Berkeley.
Graphmatica for Windows and Macs is distributed free of charge for evaluation purposes.
After one month, non-commercial users are asked to pay a $25 licensing fee.
Graphmatica for iOS is distributed via the Apple App Store.
Graphmatica can graph Cartesian functions, relations, and inequalities, plus polar, parametric and ordinary differential equations.