Svelte

About Svelte

Svelte is a radical approach to building user interfaces, created by Rich Harris and first released in 2016. Unlike React, Vue, and Angular — which do their work in the browser at runtime — Svelte is a compiler that converts component code into highly efficient vanilla JavaScript at build time. There is no virtual DOM, no runtime framework overhead, and no large JS bundle to ship to users. Svelte components use a single-file format (.svelte) combining HTML template, JavaScript logic, and scoped CSS. Reactivity in Svelte is achieved through regular variable assignments — no hooks, no signals API, just `let count = 0; count++` automatically updates the DOM. SvelteKit (the meta-framework, analogous to Next.js or Nuxt) provides file-based routing, SSR, SSG, and full-stack capabilities. Svelte 5 (released 2024) introduced Runes — a new reactivity primitive system using signals under the hood while preserving Svelte's simple assignment syntax. Svelte consistently scores highest in developer satisfaction surveys (State of JS). Despite its strong developer experience reputation, Svelte's ecosystem is smaller than React's or Vue's, and the job market for Svelte developers is limited compared to React. It is particularly popular for content sites, marketing pages, and applications where bundle size and load performance are critical.