Here is the process to uninstall the Reveal App for SFDC:
From "Installed packages" => Uninstall "Reveal App for SFDC"
Select "Do not save a copy of this package's data after uninstall"
Uninstalling this package will:
Permanently delete all components in this package
Permanently delete all customizations you have made to these components
Permanently delete all data that you have created for all custom objects in this package
Permanently delete any reports, views, and custom tabs based on the custom objects in this package
Permanently delete any relationships and related lists associated with the custom objects in this package