I've been pretty satisfied with goodnote. I came up with some suggestions that might help making this even a better notebook app. Would love it if the next update tackles one or more of them!!!

It would be better if:
1. The edge of the highlighter can be chosen between rectangular and round (currently, round edge is the only option)
2. When altering the size of an image, one of the nodes are anchored to the original position.
3. The transparency of an image is adjustable.
4. Have layers so that the order of the images from back to front is user-adjustable.
5. Separate the size alteration and rotation of the image so that the user can rotate an image without caring about size change.
6. The user is able to erase the letter only not highlighter. The other way round is already possible.
7. This might be a bug report. Please see attached file. Sometimes when I draw a line, one of the edges, which should be round, is rectangle. I don't know when that happens but certainly it's something that happens from time to time.