Quick Comparison
| Svelte | React | |
|---|---|---|
| Approach | Compiler (no runtime) | Virtual DOM (runtime) |
| Bundle size | Smaller | Larger |
| Performance | Faster (no diffing) | Fast (with optimization) |
| Syntax | HTML-first, less boilerplate | JSX |
| Ecosystem | Growing | Massive |
| Jobs | Fewer | Many more |
When to Use Svelte
- You want the smallest bundle size
- You prefer writing less boilerplate
- You’re building a performance-critical app
- You enjoy a simpler mental model
When to Use React
- You need the largest ecosystem of libraries and tools
- You’re looking for jobs (React dominates job listings)
- You need React Native for mobile
- Your team already knows React
Key Differences
Reactivity: Svelte uses $: reactive declarations and runes ($state, $derived in Svelte 5). React uses useState and useEffect. Svelte’s approach is more intuitive — just assign a variable and the UI updates.
Bundle Size: A Svelte app ships only the code it needs — no framework runtime. A React app always includes the React runtime (~40KB gzipped).
Learning Curve: Svelte is genuinely easier to learn. Less concepts, less boilerplate, closer to vanilla HTML/CSS/JS.
Verdict
Svelte for developer experience and performance. React for ecosystem and job market. If you’re building a side project or startup, Svelte is a joy. If you need to hire a team, React is the safer bet.