One simple app that's aimed at children, but that could serve as a fun entry-level guide for adults too, is the Let's Learn How to Draw app on iOS for $1.99.
The Art Therapy Draw! app includes two of them in its design: a portfolio option, and stronger security.
It's less interactive than some learn-to-draw apps, and there's nothing in the way of assistance or pointers on good technique, but you may enjoy the more free-form nature of learning like this.
Painting and Drawing Artists with iPads can pick through a long list of drawing apps.
There are plenty of other drawing apps in the various app stores that will teach you how to sketch.
The Pencil really comes into its own with sketching and drawing apps like the brilliant Paper and the sophisticated Procreate.
It groups painting and drawing apps in the Entertainment category of its App Store with movie streaming apps, talking cat games and People magazine.
It's worth spending some time trying out different drawing apps and also practicing what you've learned on paper instead of on-screen.
Then again, there are plenty of drawing apps for the iPad with much richer features than this one, some with lower prices.
There are drawing apps of every kind, but perhaps the simplest and most satisfyingly close to the real thing is Autodesk's SketchBook Mobile Express (free, Android and iOS).
Despite the myriad of drawing apps on tablets, this is the only one that will teach you how to draw Nintendo's popular creatures and it does so with the charm and polish we've come to expect from the developer.
