Open thread: iPad and iPhone art

David Hockney's A Bigger Picture exhibition, which opens at the Royal Academy this week, includes works he created on his iPad and iPhone. Hockney began experimenting with drawing on his iPhone in 2008, later adding an iPad to his drawing box.

"The iPad is like an endless piece of paper that perfectly fitted the feeling I had that painting should be big," he told the Guardian Review's Nick Wroe.

Hockney says that, when using his iPhone or iPad to draw, the features of the devices tend to shape his choice of subject. "The fact that it's illuminated makes you choose luminous subjects, or at least I did," the artist told Bloomberg. "The sunrise, for example, and flower vases with water in them that catch reflections."

What do you think of using mobile devices to draw and sketch? Has your iPhone replaced your pocket sketchbook? We'd like to know what you think of the artform, and whether you believe a work created on an iPhone can only be properly looked at on another iPhone.

Also, which are the best drawing apps out there? Hockney apparently favours Brushes, which he can be seen using in this YouTube clip. Painterly and Sketchbook have both been recommended by the Guardian's app reviewers, but there are many, many more. Which do you recommend?

People have set up Flickr groups to show off their app art creations. The Brushes Flickr group, for instance, includes some fantastic pictures.

As well as joining the discussion, we'd love you to share your app creations with us, either by posting a link in the thread below or, if you'd prefer, by emailing your artwork to us. Send it to community.coordinators@theguardian.com, with "My app art" in the subject line. We're looking forward to seeing your masterpieces.