PaintZ is a simple drawing program for the web.
Its goal is to make creating and editing drawings and other images as easy to do on Chrome OS and the web as similar native applications on other platforms, such as Microsoft Paint and KolourPaint. PaintZ is designed to to be fast and easy to use, with a touch- and mouse-friendly Material Design interface, full offline support, and no Flash Player required.
The official live instance of PaintZ can be found at https://paintz.zmyaro.com.
Chrome Web Store
PaintZ is available to install on Chrome OS through the Chrome Web Store.
That is the only legitimate Chrome Web Store listing for PaintZ.