Is there a very simple tablet app that lets your draw with your finger/has pinch to zoom, and an easy way to clear the screen and save your finger drawings?

Might do some very simple math or diagramming with my finger.


  • I use a Windows 10 tablet,an iPad Air 2 tablet, and a Galaxy S7 phone. Would be great if I could get this to work on all of them.
  • Diagrams should preferably start with a black background and white pen.
  • Would be willing to pay about 10$

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