What are some alternatives?
When comparing Microsoft Paint and KiddoPaint, you can also consider the following products
GIMP - GIMP is a multiplatform photo manipulation tool.
JS Paint - JSPaint is a web-based Microsoft Paint remake
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
GIF Paint - Like MSPaint… for GIFs.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Emoji Brush - Draw with emoji