Ranked in these QuestionsQuestion Ranking
Pro Actively developed
AdiIRC is constantly being developed and improved. It's among the most actively developed IRC clients nowadays, with a great beta team behind it. The changelog shows multiple substantial releases every month.
Pro It has all needed features
It works perfectly with Windows 10, has all the needed functions like:
1 - handle all irc:// links.
2 - start with windows.
3 - start minimized.
4 - close to tray icon when pressing X(close button).
5 - it can open all the channels in one window or open each channel in new windows (it is up to you).
6 - tons of options to pick up from.
Pro Non-disruptive installation
Configurations, scripts and snippets are saved within the installation folder, allowing you to easily move them to a different installation. It also means that nothing is changed in your system.
Does not create registry keys.
Does not create any other folder than it's own on any other location.
Even when the installer is used, you can make it portable by just moving the folder around, don't need to worry about anything else.
It's a free IRC client supported by donations.
Pro Receptive dev
Feature requests, suggestions and bug reports get prompt feedback.
The client weighs less than 1MB.
Low CPU usage. Almost no CPU usage, in fact...
Pro MSL support
The vast majority of mIRC scripts/snippets work in AdiIRC, with compatibility constantly being improved.
Pro Now playing support for most popular media players
Supports Foobar2000, Winamp, QCDPlayer, iTunes, MusikCube, MediaMonkey, XMPlay, Spotify, VLC Media Player, Media Player Classic, MusicBee, PotPlayer and SMPlayer.
Pro mIRC themes support
miRC themes also works well in AdiIRC.
Inline support for custom emotes and icons. Adding , removing or editing images replaces whole chat buffer tags in real time. AdiIRC makes your irc experience much more fun.
A portable version is also available in the download section. It can be run without installation allowing it to be run off of external devices such as USB sticks.
Pro Simple Layout or Complex Layout
You choose, Simple or Complex layout. Check the screenshots section in here.
Pro Built-in spell checker
Spellcheck for over 120 different languages is available. Full list of languages can be found here.
Pro It has a notification window built-in
(unlike hexchat which needs to manually add a script)
Pro Ability to save themes, including custom icons into a single file
Pro Multi language interface
GUI translation available in several languages with contribution by users around the globe in an online web interface found here.
Con Bad proxy support
Supposedly supports proxies but it can be difficult to get it to work with some proxies. HexChat works with it, but not AdiIRC.
Con Unintuitive interface
If you come from a mIRC, Xchat or Hexchat background, the interface seems unfamiliar and complex.
Con Ugly defaults
Ugly defaults with only one theme preinstalled.