
Sumatra PDF
Evince
calibre
MuPDF
Adobe Reader
FBReader
PDF-XChange Editor
Okular is a universal document viewer based developed by KDE.

CherryTree
Cryptee
Zim Wiki
Evernote
Trilium Notes
OneNote
Tomboy
DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.

Which is more popular?
Based on our record, Okular seems to be a lot more popular than DEVONthink. While we know about 44 links to Okular, we've tracked only 1 mention of DEVONthink.
Website, pricing, platforms and company facts side by side.
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| Website | okular.kde.org | devontechnologies.com |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
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
More videos
DEVONthink To Go for iOS: Review
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Okular and DEVONthink. 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.
If you are one of those few people who has surpassed the limits of Evernote, and even it cannot fulfill all your needs, DEVONthink 3 is just for you. In fact, calling DEVONthink a note-taking app will be undermining...
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
Then there is the big solution: https://devontechnologies.com. Source: over 3 years ago
When comparing Okular and DEVONthink, 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 DEVONthink:

A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.
Compare CherryTree to Okular or DEVONthink:

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

Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.
Compare Cryptee to Okular or DEVONthink:


Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images.
Compare Zim Wiki to Okular or DEVONthink: