AppleScript
A powerful dictionary for easy scripting.

IRC, SILC & ICB Compatibility
The result of years of chat experience.

Plug-In Love
Unlimited extensability through Plug-Ins.

Styled For You
Pick the look for your conversations.

Colors of the World
Fully compatible with mIRC colors.

Open Minded
Open source, like it should be.

Unintrusive Interface
Sleek multi- or single-window modes.

File Transfer Medly
Full DCC transfer support with resume.

They're Your Buddies
A buddy list for your IRC friends.

Express Yourself
Use the emotions that speak for you.

Multiplicity
The freedom to chat on multiple servers.

Much, Much More!
Just a better experience all-around.

Testimonials:

Colloquy is IRC for designers.

I have been trying to find a decent OS X IRC client for 2 years. You have just made the best IRC client for OS X.

I haven't used IRC in years, and this makes me enjoy it again.

Great design. The only one to recognize mIRC colors correctly so far.

The smoothest IRC application I've ever seen on any platform, and I was IRCing years ago with the Phoenix scripts on ircii.

Colloquy was one of the better designed clients with 1.0 already but now it's an extra class. Great job.

This is the IRC client that I would have built if I wasn't spending all my time on Camino.

What you have here is the beginnings of the best Applescriptable IRC client for the Mac.

I've seen a few other apps that I consider to have great user interfaces, but Colloquy is the only Open Source one.

I love Colloquy, especially it's free-ness and sleek interface.