When comparing Kompare vs QtCreator/Qt, the Slant community recommends Kompare for most people. In the question“What are the best Linux diff tools?” Kompare is ranked 12th while QtCreator/Qt is ranked 14th. The most important reason people chose Kompare is:
Kompare can create a patch file which lists the differences between two files. Patch files created this way are also compatible with the patch files created by the CLI diff utility.
Specs
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Pros
Pro Can create patch files
Kompare can create a patch file which lists the differences between two files. Patch files created this way are also compatible with the patch files created by the CLI diff utility.
Pro Supports comparing directories
Kompare can compare both files and directories.
Pro Configurable hotkeys
Because it's a KDE app, all the hotkeys are configurable
Pro Visual GUI designer
QtCreator has QtDesigner component, allowing you to design a GUI in visual mode instead of raw code.
Pro Ready-made classes for most used tasks in desktop app development
Launching external applications, getting environment variables, putting tasks to separate threads, offscreen painting, transparent loading of most used image formats, even such helpers as opening files in default application configured in OS, cross-platform (!).
Pro Cross platform
Qt supports most popular platforms including Linux, FreeBSD, Windows, and Mac OS X. This allows developers to easily port applications to different platforms.
Cons
Con Vendor lock on QtCreator
It's not simple at all to use Qt in a different IDE, and you'll lose QtDesigner.