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I had tried Lekh Diagram and Grafio both and found the latter to be better. You may want to try it out.

Lekh has better shape recognition and shape customizibility.

- you can resize vertically and horizontally independently which grafio can not

- you can move vertices of any polygon.

- You can draw bezier curve and modify it to any shape by changing the control points.

-Lekh recognizes different kinds of connections from your drawing.