When comparing Navicat vs pgModeler, the Slant community recommends pgModeler for most people. In the question“What are the best relational database design and modelling tools?” pgModeler is ranked 10th while Navicat is ranked 11th. The most important reason people chose pgModeler is:
Can generate scripts to synchronize a database.
Specs
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Pros
Pro Navicat Premium supports Amazon Redshift well
Pro It just works
Although it's a paid tool and rather expensive when compared with some of the small indie app developers on the Apple App Store, Navicat seems to have that professional polish and feels very much like a OS X app, not something that's just been ported from Windows or Linux.
Pro Diff scripts
Can generate scripts to synchronize a database.
Pro Reverse engineering
Can generate diagrams from an existing database.
Pro Export formats
Can export to SQL script file, PNG, SVG or directly to PostgreSQL.
Cons
Con Compiling
Can't be compiled in Microsoft Visual Studio because of gcc/clang extensions.
Instructions on how to compile for Windows.