Align
Creates a grid on your screen to aid you in aligning and centering your UI.
Vanilla 
Wrath of the Lich King 
Mists of Pandaria Addon Details
Expansion
Categories
Developers
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Very simple and light addon that creates a grid on your screen to aid you in aligning and centering your UI. Align is totally resolution-independent, and will create even grids no matter how you play.
I will consider any minor tweaks or updates submitted, but nothing that exceeds the small scope of the addon.
Default Toggle: /align
To change the grid size, type the number after the slash command.
Available options:
/align 32
/align 64
/align 128
/align 256
Download Align
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