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Okular is a universal document viewer based developed by KDE.
calibre
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Readest is a modern, feature-rich ebook reader designed for avid readers offering seamless cross-platform access, powerful tools, and an intuitive interface to elevate your reading experience.

Which is more popular?
Based on our record, Okular seems to be a lot more popular than Readest. While we know about 44 links to Okular, we've tracked only 2 mentions of Readest.
Website, pricing, platforms and company facts side by side.
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| Website | okular.kde.org | readest.com |
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What each product offers, as listed by its team.

Possible disadvantages
No features have been listed yet.
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
Okular is recommended for students, educators, professionals, and any users who require a reliable and feature-rich document viewer capable of handling a wide range of file formats. It is particularly beneficial for those who value open-source software and need robust annotation and document management tools across different platforms.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
okular, program for annotating your books in linux
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Okular and Readest. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

Verdict: Okular is an open source and can be used free, which is probably its main advantage. At the same time, its basic functionality is meant to be not only highly competitive with PDF Expert but rather overcomes...
Okular is another open-source and cross-platform document viewer developed by KDE and is shipped as part of the KDE Application release.
We have no reviews of Readest yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.

If you mean signing as in "signing with your handwritten signature", you could use Okular () which easily allows you to do that. Filling out forms also works nicely. Source: almost 3 years ago
I was in a similar position lately until I found Okular. Have you tried it? https://okular.kde.org/. - Source: Hacker News / about 3 years ago
I would try Okular first, though, which is free and open source: https://okular.kde.org/. Source: over 3 years ago
KOReader is good, as others have mentioned. If you want a cross platform option that's pretty good across Android/iOS/Mac/Windows/Linux, Readest[1] Is a great option. It supports syncing a library of ebooks and is AGPL licensed[2]. [1]:... - Source: Hacker News / 25 days ago
I’ve been using https://readest.com and very much enjoying it. I just wish there were a “lifetime purchase” option. - Source: Hacker News / about 1 year ago
When comparing Okular and Readest, you can also consider the following products.

Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Compare Sumatra PDF to Okular or Readest:


Evince is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS...
Compare Evince to Okular or Readest:

An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on...
Compare KOReader to Okular or Readest:

