Since Mavericks I think, launchpad decides on it's own which apps should be shown in. For example, the uninstaller apps of the adobe apps are hidden by default in Mavericks. In Mountain Lion they were shown.
Why am I interested in?
I installed an app in "Applications" folder, but it's not shown in launchpad.
I tried the following:
sudo rm ~/Library/Application\ Support/Dock/*.db
In the newly created database the app is not shown as well.
So is there a possibility that the developers flagged that app falsely as hidden like the uninstaller apps of the adobe apps? If so, how could I fix that? If not, same question. ;)