Some of the features:
* You can middle click on a reference/figure to go to the reference/figure (even if the PDF doesn't have links)
* You can middle click on a paper name in references to directly search it on google scholar
* Searchable table of contents
* Full browser-like history
* You can mark locations by character symbols (vim style)
New features since beta:
* Mac and Linux versions
* Highlights
* Ability to right click on references to open a quick overview of their location (works even the PDF doesn't have links)
* Ability to highlight the current line being read (this seems like such a minor feature, but it has extremely improved my quality of life while reading books, of course I am biased though :) )
* SyncTex support
* Dark Mode
* Ability to export your data
* Ability to synchronize your data across machines
Here is a video demo of some of the features: https://www.youtube.com/watch?v=yTmCI0Xp5vI&t=1s