Nano forum is based on Discourse and I found these apps for iOS and Android that seems to do the job. Only tried iOS but it gives notifications which was the only thing I really missed from the web version. This post was written with it
The web version works pretty well on mobile. I haven't tried web notifications yet though.
I don't know about android but a web version can never send notification on an iphone while the phone is standby or you use other apps.
I can attest to the fact that Disource web notifications have no problem in getting my attention on Android
I am trying to use discourse on an iPhone and I get the below error when trying to log in
Thanks for checking Jarvis, it's been solved.