That seems to be a presumption... I just googled "sketch application" or "sketch image editing software" I found sketchpad... alternatively, I found sketch.com

That seems to be a presumption... I just googled "sketch application" or "sketch image editing software" I found sketchpad... alternatively, I found sketch.com, which seems to be design software? I mean, it's a vague enough name that I don't think it's a good name anyways, but I'm not sure it should be obvious that this is a taken name in the way that "Photoshop" would be.