Can't vouch for it's effectiveness, but Hotwire Native might meet the needs for mobile paired with plain HTML. Despite the name, it doesn't seem that using Hotwire for the web UI is necessary to use Hotwire Native. I could be wrong about that though.
Hotwire doesn't work anywhere you can't guarantee a high-quality low-latency connection. Every UI interaction in Hotwire includes that round trip.
That's pretty much true of HTMX too (which is what GP mentions using). I mention Hotwire Native (different from plain Hotwire) because it makes it easy to wrap a web app as a mobile app. Then you can replace performance critical parts with native views, but keep everything else working through the web app portion. This is easier to maintain, albeit with the downside that everything requires network round trips. Depending on you use case, that may be an acceptable tradeoff.