Yesterday , I downloaded the Sketch 2 Trial version for testing before I buy. It’s amazing. Easy to draw. Simple UI and simple tool. First time, I don’t know how to draw it. Search origami crane on google. Download and picture. Import to sketch and draw it. Very simple and really easy. It’s only US$50 , S$ 65 . Not so much expensive like Photoshop. I am using pixelmator for a while. I am ok with it but I feel it look like for photo editing. Not feel like UI or web design development. Sketch is different. It look like design for UI and icon design. There is no photo effect option.