PDF app with a reading ruler?

I recently discovered an excellent feature in the Kindle app: a “reading ruler.” When enabled, the app displays a translucent coloured bar over the text at a certain position in the page. Screenshot:

You can change the colour, the height, and the style of the bar.

I find it speeds up my reading considerably, but I would never want to import most of my readings (PDFs) into the Kindle app. Is anyone aware of a PDF reader with such a feature? Ideally one that can open files in place (to avoid the import-export do-see-doh).

I’ve looked at Highlights, PDF Expert, PDF Viewer, and Flexcil, to no avail.

And yes, I realize I could probably use an actual physical reading ruler (gasp) to accomplish this, app-agnostic… I’m thinking about it!

Skim has this built in, on the Mac.

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Ah, that’s great, thanks! I already use Skim but hadn’t thought to check it.

(I’m hoping for iPad options, too… should’ve mentioned that.)

Were you ever able to find an iOS app that does this?

I never knew the Kindle app on iOS could do this. :grinning:

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No, never. I gave up looking! :frowning:

There’s also an app called overlays that works pretty well, and it’s not PDF specific. I don’t know if there’s an iOS version as I’m not an iPhone user.

I found one! GitHub - ahrm/sioyek: Sioyek is a PDF viewer designed for reading research papers and technical books.

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Great find (albeit not for iPad)!