Our backend and dashboard are language-agnostic, and you can access their REST API from anywhere. However, there is a Next.js SDK with server & client component

Our backend and dashboard are language-agnostic, and you can access their REST API from anywhere. However, there is a Next.js SDK with server & client components, hooks, and functions that integrate very deeply into the framework — that one is Next.js-only. We also have a setup wizard, which installs Stack Auth into your project, which works only on Next.js apps with the app router. It's as simple as: npx @stackframe/init-stack@latest