Ranked in these QuestionsQuestion Ranking
Pro Low on resources
Pro Open multiple pdfs in tabs
qpdfview is a tabbed document viewer.
Pro Switch Tabs with Keyboard Shortcuts
Pro Scale, rotate and fit
Pro Dark mode
However only inverted colors.
Pro Allows for some scripting
Opens files in named instances, open files on designated page.
Calling of userscripts on a document is thus far not possible.
Pro Supports Thumbnail Preview
Pro DjVu Support
Pro Add highlights and text annotations
Pro Reloads on changes instantly
Pro Custom background colors
Pro Fast search in all opened files
Pro Continuous and multiple-page layouts
Pro Outline, properties and thumbnail panes
Pro Fullscreen and presentation views
Pro PostScript Support
it is available on any major computer OS
Pro Supports TOC-Sidebar
Pro Deactivation of GUI elements
Pro Input forms are editable
Con No multiple mapping of commands
Having two key mappings to execute the moveUp command doesn't seem to be possible.
Con Configuration intended via GUI
There is no explicit documentation of configuration parameters used in qpdfview.conf and shortcuts.conf (those are the most important ones). However the files are editable conveniently, which is of value.