How it works
Most frameworks ship a runtime that works out what changed on the page while the app runs. Svelte does that work in its compiler instead: it turns .svelte files into code that updates exactly the parts of the page that depend on a value. Svelte 5 introduced runes, explicit markers such as $state, $derived and $effect, which make reactivity clearer and also work outside components.
SvelteKit is the official app framework: file-based routing, server-side rendering, static pages, form actions and adapters for hosts such as Vercel, Netlify, Cloudflare and Node.js. Svelte was created by Rich Harris and is developed in the open by a core team and community.
Svelte and SvelteKit pros and cons
Pros
- Small bundles and fast updates, since there is no heavy runtime
- Less boilerplate: components read like HTML, CSS and a little JavaScript
- SvelteKit covers routing, server rendering and deployment adapters
- Scoped styles, transitions and animations built in
Cons
- Smaller ecosystem and job market than React or Vue
- The move to runes left many older tutorials out of date
- Fewer ready-made component libraries
When to use Svelte and SvelteKit
Pick it when
- Fast, lightweight sites and apps where bundle size matters
- Small teams that value simple, readable components
- Interactive embeds, widgets and data graphics
Skip it when
- You need a large pool of developers to hire from quickly
- A key library you rely on only exists for React
Svelte and SvelteKit pricing
Svelte and SvelteKit vs the alternatives
Related terms
More in Frontend
Frameworks