The AppStarter is not just a simple launcher like Launchpad. It could be more effective, more convinient and easier to access your applications because it is always on the menubar.
Some of its benefits:
If you are using a favorite application on a project involving many files, you can use AppStarter to open them with just one click.
You can launch several applications with a single click.
You can create your own categories for your apps and you can export them so once you have made your own setup it could be use on any other computer without any problem. - In Launchpad you have to rearrange all of your app again after you have updated your macOS.
You can add folders, documents, webpages to your categories.
The biggest feature is the SmartTools which are bundled and could be useful when you want to do some kind of tasks that SmartTools can do. If you are interested in AppStarter, for more informations please visit its website:
http://afinta.net/appstarter.html
Best Wishes!