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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.

Re:Slack Is Buying HipChat from Atlassian by linuxftw on Friday July 27, 2018 @03:05PM (#17628334)
Hadn't seen this before. Looks nice. I tried the demo, smooth other than the /j is not an alias for /join, which I think is an obvious oversight.