I am starting to hate OS X. I've tried many PDF applications to read and annotate PDF documents. Skim was good until OS X El Captain. It became useless for annotation (by annotation, I mean drawing lines in the document. I use this way in PDF documents where words are not recognised). Preview has just stopped working 10 minutes ago and I lose a lot of annotations. Is there any sophisticated app that works well on my mac?
Maybe you could try PDFPen. It's a bit expensive thought. A trial is available https://smilesoftware.com/PDFpen/index.html
For me Foxit Reader does the job.
Well I know just what you mean by "doesn't suck". As an instructor, I am constantly editing PDF submissions using a tablet. Thus the ability to 'write' easily on a PDF is imperative. Preview just does not provide this capability. It has a 'scribble' mode, but then attempts to guess what you are drawing and changes it to match something it recognizes; but not what you want. I really, really wanted to like PDFPEN. I've used it for about 3 years because I just can't find anything else. But it is very frustrating. Versions I used did not auto-save. And I've had enough crashes with it that I've said many nasty words.. In the middle of writing, it loses its tracking with the tablet and draws strange lines. Writing too close to the edge causes issues. You are constantly changing the color back to what you want, if you annotate both with 'scribbles' and with text. The way it handles colors is maddening. I have Sierra and tried the latest V8.2.1 and it crashed so much I couldn't actually use it.
I tried SKIM and it worked really well up to Sierra. Apparently Apple changed the PDF API (PDFkit) and it broke Skim so bad I think the developers are mad at Apple.
So I still haven't found a great one. Weird.. You'd think that would not be a hard thing to purchase.
I have found OpenBoard to be a good, free alternative for marking up papers. You can import a pdf, write on it, export it to pdf -- quick. Of course, this software is designed for teachers and is free. It is also less than perfect but has an active user community. It makes my tablet much more useful, but has a bit of an efficiency learning curve. It does hang, but autosaves and so I have never lost too much material.
This is the one that satisfied what I needed in a PDF application. Unfortunately, it is only available on Apple devices. Check out its features.