Hacker News Reader

thelounge is an web based IRC client with persistence like irccloud, except that thelounge is open source and self-hosted.

A web-based client is not going to provide adequate persistence on a smartphone.

Lounge works fine on a smartphone because the actual IRC connection would be handled by a server where you host it, not your own phone.

Do you get notifications when you are mentioned on your phone though?

If your browser supports web push spec, yes!