The branding is incredibly confusing, but: Hotwire (https://hotwired.dev/) is a set of ideas about how to build dynamic web UI (“HTML over the wire”), and the Turbo, Stimulus and Native frameworks are complementary implementations of those ideas in JavaScript and native mobile code. You can use all, some or none of them to build a Hotwire-style app.
The three frameworks originated in Rails apps, so they have good Rails integrations, but there’s nothing Rails-specific about them and you can use them in any environment where HTML is sent from server to client, even a static web site.
The three frameworks originated in Rails apps, so they have good Rails integrations, but there’s nothing Rails-specific about them and you can use them in any environment where HTML is sent from server to client, even a static web site.