SvelteKit

What is SvelteKit?

SvelteKit is the official full-stack framework for Svelte, a component framework that compiles away at build time instead of shipping a runtime library to the browser. Because Svelte components compile down to plain, highly optimized JavaScript rather than diffing a virtual DOM at runtime, SvelteKit apps tend to ship smaller bundles and run faster out of the box than equivalent React-based frameworks, at the cost of a much smaller ecosystem of pre-built libraries and components to pull from.

Key features

• Compiler-based approach: Svelte components compile to minimal vanilla JS, with no virtual DOM runtime shipped to the browser
• File-based routing, server-side rendering, and API routes, giving it the same full-stack shape as Next.js or Remix
• Smaller JavaScript bundles by default, which tends to translate directly into faster page loads
• Built-in stores for state management without needing a separate state library for most apps
• Adapters for deploying to various platforms (Vercel, Netlify, Node servers, static hosting) from one codebase

Who it's for

Worth choosing when bundle size and runtime performance genuinely matter, and the team is comfortable with a smaller ecosystem than React's. Not the right pick if you need the widest possible selection of ready-made component libraries and third-party integrations, since Svelte's ecosystem, while growing, is still much smaller than React's.

Pricing

Free and open source, with no paid tier; you pay only for hosting.