Tanstack Start is the gold standard here. It’ll do a static export no problem.

Astro: https://astro.build/

From my first glance, it is not really. Has its own templating syntax, its own file format etc. With NextJS static export I only have valid react/tsx and would not want to introduce a framework-specific language. Also could not easily find something about the routing

While Astro does indeed have its own type of components, it also supports React, Solid and a host of others. So transplanting your current tree of components in, adding the React plugin and saying "GO" is likely a fairly straight-forward project. I moved a previous static site into an older verison of Astro with very little trouble.

It depends on your application, but for typical SPAs, there are any number of approaches which are better than next by every metric I (personally) care about.

Care to list those?

tanstack router

I'm surprised anyone's using Next for static exports when they've left dynamic paths broken for years.

I recently migrated to Tanstack for this and confirm it's been strictly better so far, especially having dynamic paths in my use-case (makes a hybrid app much more realistic)