Well, there are painting apps like Krita or Rebelle. But my favourite watercolour app in terms of realism for water flow, damping, brush behaviour etc is Expres

Well, there are painting apps like Krita or Rebelle. But my favourite watercolour app in terms of realism for water flow, damping, brush behaviour etc is Expressi. It is quite awesome, though quirky. http://www.expresii.com/ http://www.expresii.com/