Run it from anywhere. Close the preference window; CopySwap will continue running in the background.
Copy text as normal. To use CopySwap, highlight text you wish to swap and press Command + Option + V. Or, choose any custom shortcut within the preferences window.
CopySwap will paste your text while also grabbing the highlighted text. You can now paste this text normally, or use CopySwap again.
Work in Progress
CopySwap is a work in progress. As such, it is offered as is, with no promises on functionality or safety. Some upcoming improvements include:
Optional menubar item.
Customizable keyboard shortcut. (added in 1.1).
Automatic software updates. (added in 1.0).
Contact
I can offer only limited support but am always happy to hear feedback and suggestions. Email me at support@wohclams.net or tweet @wohclams.