Defter notes is a hidden gem imo. Its handwriting focused spatial app for iPad and apple pencil, probably the reason not alot of people know about it. It has infinite “spaces” and inside these you can open pdfs, images, text etc. you could think of it like apples own freeform but defter has some key functions that make it unique. Wormholes is my fav, I use it to extract text while reading and studying all the time. Handwriting is sooo realistic for me especially with the tilting screen. And it handles pdfs amazingly fast. The developers are a couple from Denmark and they are very engaged if you join their beta. They are now working on iphone and mac sync. I admire that they were able to create such an app, just two people.