I love this application over many others for the following reasons:
- graph paper background options
- toggle for "shape assist" is quick and easy to make diagraming look less sloppy.
- unified sketch and font mode is simple unlike the two discreet modes in Apple Notes.
I hope they would add more engineering graph paper and maybe some macros for replication and alignment some day too.
This app is worth it IMHO!
Subaqua about GoodNotes 4, v4.9.3