When comparing Kiwi IRC vs XChat, the Slant community recommends XChat for most people. In the question“What are the best IRC clients for Windows?” XChat is ranked 10th while Kiwi IRC is ranked 17th. The most important reason people chose XChat is:
While most clients allow changing the theme or style of a window, XChat gives complete control over what it looks like. It's possible to set a custom image as the background, changing font, or syntax colors.
Specs
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Pros
Pro Beautiful interface
Kiwi's default interface is aesthetically modern, while keeping a classic two-column layout with chat window on the left and nicklist on the right. Unlike many other interfaces, a considerable amount of effort has been spent on making it easy on the eyes.
The interface offers common customization options including time format changes, choice of system messages and choice of laying out channels in a tabbed or list manner.
Pro Free and open source
Kiwi IRC web client is available for free licensed under GPL with source available on GitHub.
Pro Embeddable
Code can be generated that allows embedding the IRC client within a website.
Pro Available in multiple languages
Kiwi's front-end is available in more than 20 languages including Polish, Romanian and Russian.
Pro Highly customizable look
While most clients allow changing the theme or style of a window, XChat gives complete control over what it looks like. It's possible to set a custom image as the background, changing font, or syntax colors.
Pro Works for any level of user
XChat is an advanced IRC client that is good for beginners as well as those users who like to get under the hood. It is easy to get up and running, but has all the advanced features that a power user would need.
Pro Excellent Plugin Library
XChat has a great list of plugins and scripts. Most quality IRC clients support plugins but XChats library is incredibly extensive. There is a wide range of both useful and fun plugins. It's possible to add an RSS feed or play a game of chess. Or maybe you want to control an mp3 player via chat while translating everything you type to l33t speek. XChats Plugin Library is truly extensive.
Pro Great interface
XChat's default interface is clear, well-organized and intuitive. Channels can be laid out as both tabs and in a tree structure. All components such as user lists, topics bar or even menu bar can be hidden to provide a clean way to interact. Conversely the interface can be configured to show quick access buttons for changing channel flags, sending files or performing operator actions.
Cons
Con Notifications don't time out
Notifications pop-ups have to be closed manually each time, they don't disappear on their own after a set amount of time.
Con Requires additional install, i.e. 'must have this' to run
Con Development stopped
The latest release of XChat was in 2010. An active fork is HexChat.