Stencils

Start with OmniGraffle for iPad's built-in Stencil collection for fast document creation: just touch and hold a shape, then drag it into the canvas. If you prefer a more hands-on approach, tap the Draw button in the toolbar to enter Draw mode. Choose the shape you want from the Shape Inspector, then drag out custom-sized shapes. To draw a line, just touch and hold the canvas, then drag. Adjustable shapes such as stars and circles can be manipulated with the touch of a finger, so you can easily change a 5-pointed star into an 12-pointed star (and decide just how pointy you want its points to be) or draw a perfect quarter-circle. 

Built-in stencils include Shapes, 3D Shapes, Connections, Fonts, Fills, Software, and Variables. Many third-party OmniGraffle stencils are also supported.

Diagramming Tools

OmniGraffle for iPad knows what makes a diagram different from a drawing, and can keep lines connected to shapes even when they're moved. In Draw mode, touch and drag to connect shapes together. The Diagram Layout inspector gives you several options for automatically rearranging your diagram—touch "Lay out now" and your shapes will be magically organized across your canvas. Use the standard pinch gesture to zoom in and out, so you can focus on a detailed area of your canvas, or zoom out to see the big picture.