localhorst is an experimental way to keep small websites inside a browser. The product page explains that the sites are saved in browser localStorage and can live under different routes, such as an about page or a nested site path. It is not a conventional hosting provider that publishes a shared copy for visitors on other devices.
The editing pattern is simple: append the edit query to a page URL, change the site, then reload the address without that query to view the result. The author describes writing ordinary HTML and JavaScript, with the option to include external libraries. This gives a technically comfortable user a lightweight place to experiment with a page without setting up a separate deployment pipeline.
The local-storage model is also the main limitation. A browser profile contains the saved work, so another browser or device does not automatically see the same site, and clearing site data can remove that local copy. Including an external library can still create a request to that library provider, even though the saved page content is local. localhorst is most naturally a personal playground for small web experiments rather than durable production hosting, collaboration or a backup service.
