When comparing Jarnal (Java, cross-platform) vs PDF Expert, the Slant community recommends Jarnal (Java, cross-platform) for most people. In the question“What is the best software to annotate a PDF?” Jarnal (Java, cross-platform) is ranked 4th while PDF Expert is ranked 9th. The most important reason people chose Jarnal (Java, cross-platform) is:
It is possible to connect multiple Jarnal clients to a single Jarnal server for collaboration on the same document. However, only one person can make changes at a time.
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Pros
Pro Collaboration over network (although limited)
It is possible to connect multiple Jarnal clients to a single Jarnal server for collaboration on the same document. However, only one person can make changes at a time.
Pro Free and open-source (GPL license)
Pro Fast and smooth
It is a software focused on consumption and not in editing PDF (yes, you can accentuate highlight, draw shapes and sign). They managed to build a nice looking efficient product in which they propose to do.
Cons
Con Some actions are not intuitive
Opening a PDF into Jarnal is not intuitive. The only way I found is by using the supplied shell script. I could not find how to do it from within the UI.
Con Written in Java using Swing toolkit
As with most Java apps, the UI looks alien to all operating systems.
Con Expensive for what it offers
It is an item that improves aspects of PDF reading (which is free: Preview) but lacks professional features that other similar software has.
Con Missing settings options
Lacks basic settings like anti aliasing level.