What are some alternatives?
When comparing Affinity Designer and DrawPad, you can also consider the following products
Sketch - Professional digital design for Mac.
CorelDRAW - CorelDraw is a world’s most leading Graphic Design Software solution created by Corel Corporations.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Adobe Illustrator - Adobe Illustrator is a vector graphics editor.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
GIMP - GIMP is a multiplatform photo manipulation tool.