Here’s my “up to date”, comprehensive, but still incomplete, list of Adonit Pixel compatible apps for the iPad/iPad Pro.
MOST apps listed support both screen pressure sensing and palm rejection, unless otherwise noted
Compatible Adonit Pixel apps for drawing
Animation Desk
Amaziograph
ArtRage
ArtRage Vitae
Art Studio Pro ( fully supports the Adonit Pixel and is just as great as Procreate on the iPad )
AutoDesk SketchBook
Colored Pencil
Comic Draw
Concepts
Forge ( drawing/sketching/concept/ideation app )
Interactive SketchBook
Medibang Paint
Procreate
(Adonit Pixel has been supported as an “unsupported stylus”, for some time now, but all Adonit Pixel stylus features still work as they should in Procreate, palm rejection is, now, hit or miss with the Adonit Pixel (not sure why ), but can be improved using a special, non-body electrical conducting, lycra-based material drawing glove )
Tayasui Sketches/Sketches Pro ( Full support for the Adonit Pixel )
Tayasui Sketches School ( FREE! )
( this free version works with this stylus, but without any palm rejection or pressure sensing, so you need to use a special, non-body electrical conducting drawing glove with the Sketches School version to lay your hand/palm down on the iPad’s screen while writing or drawing )
Vectornator
Zen Brush 2
Compatible Adonit Pixel apps for Notes and Notes with drawing types of apps.
CollaNote ( palm rejection ONLY! Such palm rejection settings within App. NO pressure sensing for thin to thick/light to dark lines)
GoodNotes
INKredible
Note Shelf 2
Notes Writer ( palm rejection improved using special, non-electrical conducting, lycra-based material drawing glove )
QuickNotes X Pro ( palm rejection ONLY. No pressure sensing for light/dark or thin/thick lines )
uPad
Zoom Notes
PDF Pen
This is pretty much it for Adonit Pixel compatible note-taking apps.
This stylus works with other non-compatible apps, too, but without any palm rejection and/or pressure features.
You can use this stylus with other apps but will not be able to lay your palm on the screen, while you write or draw, unless you use special, non-body electrical conducting, lycra-based material drawing glove that works by isolating your hand/palm and allow you to lay your hand/palm on the screen as you draw in these non-compatible Adonit stylus apps.
Something like these found on Amazon.
https://www.amazon.com/AKX-Rejection-Drawing-Graphic-Sketching/dp/B08R6PWKC9/ref=sr_1_33_sspa?dchild=1&keywords=tablet+drawing+gloves&qid=1611535160&sr=8-33-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExMFg5WFBZWFpCS1kmZW5jcnlwdGVkSWQ9QTA5OTA2MzMxRUVYUURUMlAwVU4wJmVuY3J5cHRlZEFkSWQ9QTAxNDY1NjMxVjg1NE45TVRXSUQ3JndpZGdldE5hbWU9c3BfYXRmX25leHQmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl
https://www.amazon.com/Timebetter-Rejection-Drawing-Sketching-Suitable/dp/B08DKGHYMS/ref=sr_1_21?dchild=1&keywords=drawing+gloves&qid=1611533128&sr=8-21
Many more makers of these types of gloves found on Amazon and in different hand sizes, as well!
Best of Luck to You!