The following styluses are supported in GoodNotes 5:
- Apple Pencil 1st generation
- Apple Pencil 2nd generation
- Logitech Crayon
- All non-Bluetooth capacitive styluses
Why doesn't GoodNotes 5 support third-party smart-styluses?
After carefully investigating the effort and considering all ramifications, we have decided to focus on optimizing GoodNotes 5 for the use with first-party stylus technology found in the Apple Pencil, and the Logitech Crayon. We believe that the future of handwriting is on digital devices and a future like this is only possible when hardware and software work seamlessly together . As for now, quality without compromises, including low-latency writing and pressure-sensitivity can only be delivered using these first-party styluses.
Apple is fully committed to this future and almost  all iPads released in recent years fully support the Apple Pencil. What has been previously reserved for high-end models like the iPad Pro 12.9 and 9.7" inch, is now available for entry-level models like the iPad 6th generation, too.
We want to express our excuse to those of you who updated from GoodNotes 4, believing their third-party stylus would still work as it used to in our previous version. If you haven't used the free upgrade bundle to get GoodNotes 5, we recommend trying to request a refund from Apple and download GoodNotes 4 instead, if you want to continue using your third-party stylus.
 The iPad's screen constantly scans the Apple Pencil's position and is able to distinguish between Pencil, and finger/palm input. This technology is not available to third parties, other than Apple's direct partner Logitech.
 Since November 2015, the only iPad Model released without support for the Apple Pencil has been the iPad 5th generation (August 30th, 2019)