
Sumatra PDF
Evince
calibre
MuPDF
Adobe Reader
FBReader
PDF-XChange Editor
Okular is a universal document viewer based developed by KDE.
Extism
OpenCV
TensorFlow
CImg
OpenGL
PyTorch
MATLAB
Application and Data, Languages & Frameworks, and Language Extensions

Which is more popular?
Based on our record, Okular seems to be more popular. It has been mentioned 44 times since March 2021.
Website, pricing, platforms and company facts side by side.
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OCL
OpenCL
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| Website | okular.kde.org | en.wikipedia.org |
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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.
No analysis of OpenCL yet.
Walkthroughs and reviews on video.
okular, program for annotating your books in linux
More videos
Episode 1: What is OpenCL™?
More videos
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Okular and OpenCL. 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 OpenCL 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
Tracking OpenCL since Mar 2021.
When comparing Okular and OpenCL, 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 OpenCL:

Extism is the open source, universal plug-in system. Extend all the software everywhere! Powered by WebAssembly.
Compare Extism to Okular or OpenCL:

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



TensorFlow is an open-source machine learning framework designed and published by Google. It tracks data flow graphs over time. Nodes in the data flow graphs represent machine learning algorithms. Read more about TensorFlow.
Compare TensorFlow to Okular or OpenCL: