FunctionVisualizer: Graph Calc

Function Visualizer turns your iPhone and iPad into a fast, fully offline graphing calculator: type an expression and get a crisp plot instantly. Four plotting modes - Functions y=f(x): plot up to five curves at once; every pairwise intersection is solved and labeled with its exact coordinates - Polar curves r=f(theta): cardioids, roses, spirals and more - Parametric curves x(t), y(t): Lissajous figures, circles and ellipses - 3D surfaces z=f(x,y): height colored with a jet palette, clear axis box and ticks, drag to rotate and pinch to zoom Flexible controls Set the domain of each function, drag the a/b/c/d parameter sliders for instant preview, white grid background, a distinct color for every curve, intersections marked at a glance. Everyday convenience Save the current plot to Photos with one tap - handy for students, teachers, engineers and researchers. The interface is available in Simplified Chinese, English and Japanese. Everything is computed locally on your device. The app is completely free: all features are open to everyone, with no trial, no paywall and no in-app purchase.