This app is for anyone who likes to capture their ideas in digital form. With a "natural drawing experience and clean user interface that gets out of your way, SketchBook has everything you need" to create sketches and digital art.
Notability is a note-taking app: annotate documents, sketch ideas, record lectures on your iPhone, iPad, and Mac. It combines handwriting, typing, audio recordings, and photos so you can create notes that fit your needs.
This app lets you jot down ideas, sketch ideas or take notes just as you would with your paper notebook. Users can choose from grid, lined or blank backgrounds. The grid background helps with sketching accurately and to scale.