What are some alternatives?
When comparing YouiDraw and Sketch, you can also consider the following products
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Adobe Illustrator CC - Adobe Illustrator CC is a commercial vector graphics editor.
Affinity Designer - Professional creative software, exclusively for Mac.
CorelDRAW Graphics Suite - Empower your creativity with CorelDRAW Graphics Suite 2018, packed with powerful features and updates to transform creative ideas into visually stunning designs! Learn more or download a free trial today!
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.