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

A set of icons that stand out on any wallpaper. Use it with any dark wallpaper for better effect.

What's included:

★ 4.000 + HD icons (256x256)
★ Matching HD cloud wallpapers!
★ Launchers support: Action, Adw, AdwEX, Apex, Atom, Aviate, GO, Next,Nova, Smart, Solo...
★ Icon masking for un-themed icons
★ Dynamic calendar (For Nova Launcher)
★ Alternative icons to choose
★ Updates.