Variable...
Autodesk Sketchbook and Procreate apps.
Paper by 53 app.
Adobe Sketch and Lightroom.
Microsoft Fresh Paint.
ArtRage app.
The main thing about my style...? It's quick. All of these pictures were created in the past few days, all in around an hour each piece. I trained as a traditional animator and prefer to work fast (but can pace myself over longer hours too when needed. I've got a 4 hour piece to post soon once it's been published...)
Paper by 53.
But the other thing is that an app (or stylus) can flavour what I do... An ArtRage piece often looks completely different to a Sketchbook piece. And that's one of the thing I love about apps. The range, the variety, the options to mash, to take a picture and throw it through three or four different art tools to complete three or four tasks.
Love it. Mobile. Art. Revolution.