The main difference is that Svelte is a compiler, while React, Vue, and Angular are runtime frameworks. React and Vue use a virtual DOM to manage UI updates in the browser, while Angular uses a complex runtime with two-way binding. Svelte, instead, compiles your code at build time into efficient vanilla JavaScript, which directly updates the DOM without a virtual DOM or heavy runtime.
No virtual DOM – unlike React/Vue, Svelte updates the DOM directly.
Compile-time framework – most work happens during build, not in the browser.
Smaller bundle sizes – faster apps with less overhead compared to Angular/React.
Less boilerplate – Svelte’s reactivity is built-in, while React/Vue need extra hooks or APIs.
Simpler learning curve – fewer concepts than Angular or React’s ecosystem.
In short, React, Vue, and Angular provide a runtime system to manage changes in the browser, while Svelte eliminates most of that runtime work by compiling everything ahead of time, making apps faster and often easier to write.