Set up your chat once. Get it on every character.
WoW remembers your chat windows per character, so every new alt starts with the plain default layout — and you rebuild the same tabs and channels over and over. Chat Sync fixes that.
Save a character's chat setup as a profile and reuse it on any other character on your account. A brand-new character can even be offered your layout the moment it logs in.
What it saves: your tabs and their order, each tab's channels and message types, tab names, background color and transparency, font size, and window sizes/positions — including tabs pulled out into floating windows.
How you use it: save your main's chat as a profile; new characters get offered it on first login; apply it to existing characters anytime. It even keeps the profile current when you tweak the source character — or use the one-click Save changes button.
Minimap button + /chatsync (/cs). Your existing characters are never changed behind your back.