How do Remix and Astro compare for different project types?

Choosing between Remix and Astro depends on project requirements. Choose Remix when: building a web application (not just a content site) with complex user interactions, forms, authentication, and real-time updates. High interactivity — social platforms, dashboards, SaaS apps. You need the full React ecosystem. Progressive enhancement is important — forms must work without JS. Real-time data that invalidates frequently. Choose Astro when: building content-focused sites — blogs, documentation, marketing, e-commerce, news. Performance and Core Web Vitals are the top priority. Content comes from multiple CMSs (Markdown, Contentful, Sanity). You want framework flexibility — mixing React with Vue or Svelte islands. Build-time generation of thousands of pages. Zero JS by default is desirable. Hybrid projects: use Astro for the marketing/blog pages (fast, SEO optimized) and Remix/Next.js for the application (dashboard, user portal). Both frameworks complement each other at the architectural level. Neither is "better" — they target different problem spaces.