iONs is an icon pack. It is not a stand alone application you need a third party launcher to apply it.

What you get:

1. 3.400+ handmade icons (192x192)
2. 76 cloud HD wallpapers
3. Support 26 launchers
4. Icon requests
5. See & Search all icons
6. Icon Requests
7. Supports Muzei
8. Help section that guides how to setup your launcher.