In contrast, I had a not-so-great experience attempting to use SvelteKit for a not-full-stack SPA. I wanted an SPA "app" for a side project I'd already written in Elixir/Phoenix and kit turned out to be super immature for that. There's a lot of issues with building a "true" SPA in kit - it is built first and foremost for full stack and will throw up a hundred ways if you try to make an SPA, chiefly by making it inconvenient to use client-only libraries even though you're never running on a server. Svelte is pretty cool but if you want to make an SPA I would recommend vanilla Svelte + Routify instead of Kit.

(Or just React. React is pretty good, and vite comes with a React starter that's super good! You don't have to throw something out just because it's "old"!)