A compiled framework
React, Vue, Angular are runtime frameworks: the browser loads a library (~30-50 KB minified) that then interprets components. Svelte, created by Rich Harris (journalist at New York Times, ex Guardian) in 2016 and reaching version 3 in April 2019, changes approach: the framework is a compiler, the resulting runtime is minimal.
Each .svelte component is compiled to vanilla JavaScript directly manipulating the DOM. No virtual DOM. No reconciler. Per-page bundles of a few KB instead of tens.
MIT licence.
Svelte 3 — reactivity as language
In Svelte 3 reactivity is native syntax:
<script>
let count = 0;
$: doubled = count * 2; // reactive: recomputes when count changes
</script>
<button on:click={() => count++}>
Clicked {count} — doubled is {doubled}
</button>The compiler analyses static dependencies and generates minimal update code. Development experience is lighter than React (no hooks, no dependency arrays, no mental re-render tracking).
SvelteKit — full-stack framework
SvelteKit, the full-stack framework for Svelte, is in public beta in October 2021 (version 1.0 December 2022). Brings Svelte beyond the SPA world:
- File-based routing
- SSR / SSG / CSR on per-route basis
- Load functions for data fetching
- Form actions with progressive enhancement
- Adapters for deploy on Node, Vercel, Netlify, Cloudflare, static
- Vite base (after migration from Snowpack/Rollup)
Adoption
Svelte is Top-3 framework for developer satisfaction in State of JS survey from 2019. Broad adoption in:
- Content-heavy sites
- Dashboards
- Mobile PWA
- Complex SVG animations — Rich Harris comes from data viz
Rich Harris was hired by Vercel in November 2021 to work full-time on Svelte.
Svelte 5 (2024)
Svelte 5 (2024) introduces runes — more explicit reactivity syntax with $state, $derived, $effect — while maintaining the compiled-away philosophy.
In the Italian context
Growing adoption in small Italian teams and freelancers for sites with optimal exposure (reduced bundle, high Lighthouse performance).
References: Svelte 3 (April 2019), SvelteKit public beta (October 2021) → 1.0 (December 2022). Rich Harris, Vercel (from November 2021). MIT licence. Vite base. Svelte 5 (2024) with runes.