svelte
Svelte is a UI framework that works as a compiler, turning declarative component code into lean, framework-less JavaScript that updates the DOM directly rather than relying on a runtime virtual DOM.
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[](https://opensources.dev/resource/svelte)MITPermissive — free to use in commercial and proprietary software, with attribution.View license →
Production readiness
4/5- Actively maintainedCommits in the last 6 months
- No known vulnerabilitiesNot yet scanned
- Clear, usable licenseMIT (permissive)
- Proven adoptionWidely used
- Has documentationDocumentation indexed
npm install svelteOur analysis
Svelte is a component-based UI framework whose distinguishing trait is that it compiles components at build time into imperative DOM-manipulating JavaScript, eliminating most of the runtime overhead found in virtual-DOM frameworks.
When to use svelte
Use Svelte when you want highly reactive UIs with minimal boilerplate, small bundle sizes, and excellent runtime performance. It's well-suited for interactive widgets, dashboards, marketing sites, and full apps (especially via SvelteKit) where developer ergonomics and bundle size matter.
When not to
If your team and ecosystem are heavily invested in React's vast component/library ecosystem (React Native, large component libraries, enterprise tooling), or you need the deepest hiring pool and third-party support, React or Vue may be safer bets. Svelte 5's runes also represent a significant model shift that may be a learning hurdle for teams expecting prior reactivity.
Strengths
- Compiler approach yields small bundles and no virtual-DOM diffing overhead
- Concise, low-boilerplate syntax with built-in reactivity, transitions, and stores
- Scoped styling and template features built into the language
- Mature companion meta-framework (SvelteKit) for routing and SSR
Trade-offs
- Smaller ecosystem and fewer third-party component libraries than React/Vue
- Reliance on a compiler/custom file format means tooling lock-in for .svelte files
- Svelte 5's runes reactivity model is a notable migration and mental-model change
- Smaller hiring pool and community resources compared to incumbents
Maturity
Highly mature and production-proven, with ~87k GitHub stars, an MIT license, active maintenance, a public roadmap, and major releases (Svelte 5). Funded through Open Collective and backed by a dedicated team plus volunteers; widely used in production via SvelteKit.
What is Svelte?
Svelte is a new way to build web applications. It's a compiler that takes your declarative components and converts them into efficient JavaScript that surgically updates the DOM.
Learn more at the Svelte website, or stop by the Discord chatroom.
Supporting Svelte
Svelte is an MIT-licensed open source project with its ongoing development made possible entirely by fantastic volunteers. If you'd like to support their efforts, please consider:
Funds donated via Open Collective will be used for compensating expenses related to Svelte's development such as hosting costs. If sufficient donations are received, funds may also be used to support Svelte's development more directly.
Roadmap
You may view our roadmap if you'd like to see what we're currently working on.
Contributing
Please see the Contributing Guide and the svelte package for information on contributing to Svelte.
Is svelte.dev down?
Probably not, but it's possible. If you can't seem to access any .dev sites, check out this SuperUser question and answer.