Re:Slack Is Buying HipChat from Atlassian
by xPaw on Friday July 27, 2018 @04:21AM
(#17624388)
The Lounge is an IRC client that solves the problems you describe (persistence on any device, synchronised unread counters, push notifications) - https://github.com/thelounge/thelounge
It does require having your own server to host it on though.
It does require having your own server to host it on though.