Who's going to babysit the iOS push server? Colloquy already has this and I modified an IRC server to support it but the push server is down so often it's not usable. I'd run the push server myself but Apple requires that I pay them $100/year, buy a macintosh, and convince them my version of the app is substantially different all for the privilege of maintaining a service required to support their miserable OS.
EDIT: ah, of course it's Android only.
EDIT2: They absolutely are Apple problems. Unfortunately Apple has convinced their users that they are IRC problems and the practical reality is that Apple users will not use IRC unless they're fixed which for me means setting up eg MMS bridges with cheogram which is a major pain. Thankfully we're getting web push on iOS next year and that will (hopefully) make all these problems effectively go away.
You can always give the possibility that the user enters his API key to Pushover and by pushover you can receive push notifications, I have already written many programs that work with Pushover, one works to this day, every 6 hours I get the current price of bitcoin back with a difference whether the price has decreased or increased.
It's really convenient, I don't even have to pull out my phone because notifications come straight to my Apple Watch.
I really miss MutterIRC client for iOS, it was probably the best client, all you had to do was install MutterIRC module on your ZNC, download iOS app and log in to your ZNC account.
It was like using WhatsApp, you always got a push notification if someone wrote to you or wrote you a nick in a chat.
I would really like MutterIRC to come back or some alternative to this application.
When I was at work I got a push notification and could quickly write back on IRC chat. That's how it should work.
Unfortunately, MutterIRC is not working since 2019.
It uses IRCv3 chathistory + a proposed extension for push notifications.