Primarily I've been using Zotero and Notability. They each have "save to" on mobile. Zotero has a chrome plugin that requires the desktop app to be running. Th

Primarily I've been using Zotero and Notability. They each have "save to" on mobile. Zotero has a chrome plugin that requires the desktop app to be running. They both optionally support a dark mode for reading in the dark. I like the experience of reading in Muse.app on the iPad. It's a nested whiteboarding thing, but also can act as a PDF reader. (It'll let you pull out chunks of the PDF and put it on your canvas with a link back into your document, if that fits your flow.) I often read on my phone, so this is not an option for me. Apple Notes and Muse slow down with a lot of ink. For taking a page full of notes I'm using Notability. I've heard good things about GoodReader, but haven't played with it in years.