VersionSQL ships with its own internal diff viewer.  However, you can configure it to use any diff or merge tool that can be run from the command line.

VersionSQL will auto-detect the following, if installed:

• Araxis Merge
• Beyond Compare
• DevArt Code Compare
• SourceGear DiffMerge
• KDiff3
• Meld
• Visual Studio 2017 and 2019
• Visual Studio Code
• WinMerge