Can anyone recommend a good PDF reader? My wife wants to start reading PDFs on her iPad but a big thing for her is that she wants the ability to change the background color of the documents she reads so it's easier on her eyes. Apparently that's not a popular feature because none of the apps seem to tout that as one of them. GoodReader looks like a promising app but we'd prefer to know for sure it has this feature beforehand. Any suggestions?
I am going to have to check about changing backgrounds, and even then I think it could only work in "text-based" PDFs and not image-based ones. And I am unaware of any apps that do that.
That said, I'd argue that the best three PDF readers (and annotators) are PDF Expert (from the folks who make ReaddleDocs, the excellent file manager); GoodReader; and iAnnotate PDF. Dropbox's app is a decent PDF reader, as is ReaddleDocs. They are all now retina-capable too.
None of them have the ability to invert the screen. I only recently got GoodReader (I pretty much test out all of the productivity software; don't even ask how many note-taking apps I have!), but I have come to find that PDF Expert is the best of the lot - although all three are very good.
I disagree that PDF isn't great for reading. PDFs can be anything, from a full-glossy magazine to a scan of a book, to an article. Indeed, I keep all of my publications (the ones I have published) in PDFs in the DevonThink to Go app. I use PDFs all the time, and love that I can get them on the iPad; and with the new display, they are often better than on paper. It was because of PDFs and the frustrations using them on a 7" screen that I was drawn from the Galaxy Tab to the iPad. AND with the retina display, PDFs are even better. The iPad is designed, imho, for readers.
In both iBooks and Kindle you can at least tweak the brightness - but then again you can do that with the default brightness settings too, and that can have an impact.
Not only do I use it for reading, but I often will create PDFs of my lecture notes and use them when teaching.