What is the difference between Remix and Next.js?

Both are React full-stack frameworks but with different philosophies. Data loading: Next.js uses React Server Components (with Server Actions in Next 13+); Remix uses loaders/actions (web standard Request/Response). Routing: Next.js has file-based routing with layouts via layout.tsx; Remix has nested routing with parallel data loading and granular error boundaries. Mutations: Next.js uses Server Actions or API routes; Remix uses form Actions that are progressive-enhancement-first. Caching: Next.js has complex caching layers (full route cache, data cache, router cache); Remix uses HTTP cache headers and defers to the browser/CDN for caching. Edge: Remix was designed for edge runtimes (Cloudflare Workers) from day one; Next.js has partial edge support. Philosophy: Next.js embraces new React features (RSC, Transitions) early; Remix prioritizes web standards and progressive enhancement. In 2024, Remix merged into React Router v7, blurring the distinction further.