PackageCompatUI is a terminal text interface to the [compat] section of a Julia Project.toml file. You can find more about how it works in the original announcement.
The new version 1.1 does not change much about it, except that now it can be installed as a Pkg App!
In Julia 1.12 or later, enter the package manager REPL mode with ] and install the app with
pkg> app add PackageCompatUI
and make sure you have ~/.julia/bin in your PATH.
Then you can change directory to your package and run compat_ui from the command line. This brings you straight into the text interface.