Okular is #7 in Top 10 PDF Readers

https://okular.kde.org/

The Universal Document Viewer. Multi-platform, fast and packed with features, Okular allows you to read PDF documents, comics and EPub books, browse images, visualize Markdown documents, and much more.

Positions in ratings

#7 in Top 10 PDF Readers

Alternatives

The best alternatives to Okular are: Evince, Sumatra PDF, Zathura, Adobe Acrobat, Foxit Reader