Svelte is a JavaScript framework for building user interfaces. It's similar to other popular JavaScript frameworks like React, Vue, and Angular, but with a key difference: it doesn't use a virtual DOM. Instead, Svelte compiles your components at build time, so the framework doesn't need to run any code at all in the browser. This means that Svelte apps can be faster and use less memory than equivalent apps built with other frameworks. Svelte also has a small learning curve and it is easy to pick up.

Svelte is developed by Rich Harris, who is a developer at the New York Times.

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Number of contributors 30 days




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Top contributors all time

Rich Harris2995
Richard Harris686
Tan Li Hau310
Ben McCann175
Simon H146
Puru Vijay117
Yuichiro Yamashita63
Arpad Borsos33
Jacob Wright30
Luke Edwards30
Luca Bonavita29
Daniel Sandoval26
Geoff Rich23

Top contributors last 30 days

Ben McCann5
Simon H2
Dani Sandoval1
Emmanuel Ferdman1
Mathias Schäfer1
Min Kim1
Ravi van Rooijen1
Sanjaiyan Parthipan1
Sina Salahshour1


Cybernetically enhanced web apps: Svelte

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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.


You may view our roadmap if you'd like to see what we're currently working on.


Please see the Contributing Guide and svelte package for contributing to Svelte.


Pull requests are encouraged and always welcome. Pick an issue and help us out!

To install and work on Svelte locally:

git clone
cd svelte
pnpm install

Do not use Yarn to install the dependencies, as the specific package versions in pnpm-lock.json are used to build and test Svelte.

To build the compiler and all the other modules included in the package:

pnpm build

To watch for changes and continually rebuild the package (this is useful if you're using pnpm link to test out changes in a project locally):

pnpm dev

The compiler is written in JavaScript and uses JSDoc comments for type-checking.

Running Tests

pnpm test

To filter tests, use -g (aka --grep). For example, to only run tests involving transitions:

pnpm test -- -g transition

The source code for lives in the sites folder, with all the documentation right here. The site is built with SvelteKit.

Is down?

Probably not, but it's possible. If you can't seem to access any .dev sites, check out this SuperUser question and answer.