Apps that allow you to paint on tablets, mobile phones or other touch-enabled devices are versatile and many have compatible network storage, but if you just want to remember something or draw a concept In the case of drafts, the "Google Chrome Screen" which Google has released discreetly can meet your needs.
Chrome Canvas is very simple, just open the canvas.apps.chrome page through a browser (not necessarily Chrome, as long as you support WebAssembly), you can start painting directly. The interface provides four manuscripts, such as pencils, pens, oil-based pens and carbon strips, and the rubber tool, but unlike many similar tools, the content it draws is actually a bitmap, not a vector. That is, the two superimposed lines are already "mixed" together, and the friction can only be erased together, not just one.
Although it can be designed with a mouse or a touchpad, this tool is obviously best suited for flat-screen fingers and even for drawing. After completing your masterpiece, you can save it as a png file, but almost the current function is like this. I do not know if Google will increase its functionality if it's used more.