Using PDFpen with a Stylus
PDFpen is designed to work with a pressure-sensitive stylus.
In PDFpen’s scribble markup tool, PDFpen uses the pressure of the stylus to vary the stroke width for natural and expressive document markup.
PDFpen supports the following styluses:
Apple Pencil
Pencil from FiftyThree
Jot Touch & Jot Script from Adonit