When comparing NameChanger vs Karabiner, the Slant community recommends Karabiner for most people. In the question“What are the best power user tools for macOS?” Karabiner is ranked 29th while NameChanger is ranked 76th. The most important reason people chose Karabiner is:
For example: Fn+C now calls up contextual menus for me with: <!-- Fn + C = same as right-click mouse --> <item> <name>kybd control click</name> <identifier>private.keybd_to_control_click</identifier> <autogen> __KeyToKey__ KeyCode::C, ModifierFlag::FN, KeyCode::VK_MOUSEKEY_BUTTON_RIGHT </autogen> </item>
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Pros
Pro Free
Available free of charge.
Pro Allows easily batch renaming files
For anyone who's ever needed to re-sequence or rename a list of items in a folder, it can take a long time to hit "Enter", type your new file name, "Enter","Arrow Down", "Enter", Type, "Enter", "Arrow Down", "Enter", Type, smash you head against the keyboard.
Name changer allows you to batch rename those files in one step. Options include replacing the first, last or every occurrence of user defined text, removing text, append or prepend text, searching with wildcards, sequencing and even has support for inserting dates. It shows you a preview of the new file names before committing any changes.
Pro Low-level key bindings/mappings
For example: Fn+C now calls up contextual menus for me with:
<!-- Fn + C = same as right-click mouse -->
<item>
<name>kybd control click</name>
<identifier>private.keybd_to_control_click</identifier>
<autogen>
__KeyToKey__
KeyCode::C, ModifierFlag::FN,
KeyCode::VK_MOUSEKEY_BUTTON_RIGHT
</autogen>
</item>
Pro Make FN key into a new modifier key for custom shortcuts across apps
Cons
Con Difficult to configure custom actions
Configuring custom actions requires editing an XML file with very strange syntax, for which it's difficult to find good documentation.