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I use this one and it’s a digital version of the good old tracing paper.
http://www.morpholioapps.com/trace/
That looks like a great app, and I think I have tried it, but I could get used to it for some reason. I think that you have to work with an app and get used to it. Like sketching with a pencil, you have to get paper you like and pencils that you like. On the ipad I have tried Adonit, paper 53 and wacom styli, but i really, really like the apple pencil.