If you're open to a paid solution, IRCCloud is probably the most modern IRC client available today. It's $5/month, but nothing else I've used has come close in

If you're open to a paid solution, IRCCloud is probably the most modern IRC client available today. It's $5/month, but nothing else I've used has come close in terms of general interface quality across all devices, from Android to my iPad to my desktop. As interesting off-topic trivia, it was written in Erlang.