Astro is a meta-framework that allows you to plug in other web frameworks where you need it (React, Solid, etc). Although it would also be fair to consider Astr

Astro is a meta-framework that allows you to plug in other web frameworks where you need it (React, Solid, etc). Although it would also be fair to consider Astro a sort of build tool / bundler. Node is a runtime, not a framework. So there's really only one framework here (Astro). Using other web frameworks within it is completely optional.