You're building an analytics dashboard UI, and your React app's bundle has grown to 500 KB? Svelte offers an alternative: compiled components, no Virtual DOM, and a bundle size 2–3 times smaller. This isn't theory—in practice, Svelte widgets load faster and run smoother on low-end devices. We are a team with over 10 years of development experience and have delivered more than 40 projects, including an interactive map for a real estate agency: the bundle was 30 KB, load time reduced by 40% compared to the React version, and animations run smoothly on devices with 2 GB of RAM. As noted in the official documentation: Svelte shifts work to compile time, reducing bundle size. If you want to order a Svelte website, start with a consultation—we'll propose the optimal solution.
Why is Svelte faster?
React and Vue work through a Virtual DOM—they create a virtual tree and diff against the real DOM. Svelte determines at compile time which parts of the DOM will change when state updates and generates targeted DOM updates:
<!-- Svelte compiles this into --> <script> let count = 0; </script> <button on:click={() => count++}> Clicked {count} times </button> <!-- ...approximately this JS: --> // element.textContent = `Clicked ${count} times`; // (direct update without diffing) Result: less code in the bundle, higher load speed. For example, a typical widget in Svelte weighs 20–30 KB, while a React counterpart is 60–80 KB. You get significant budget savings by reducing the cost of transmitting and processing JavaScript.
What are Runes and how to use them?
Svelte 5 replaces implicit reactivity with explicit runes:
<script> let count = $state(0); let doubled = $derived(count * 2); $effect(() => { console.log('count changed:', count); }); </script> <button onclick={() => count++}>{count} × 2 = {doubled}</button> $state is reactive state, $derived is a computed expression, $effect is reactive side effects. Runes work at the compiler level, so no imports are needed.
How to create a component with props and stores?
<!-- UserCard.svelte --> <script> let { name, age, onSelect } = $props(); </script> <div class="card" role="button" onclick={onSelect}> <strong>{name}</strong> <span>{age} years</span> </div> <style> .card { padding: 16px; border-radius: 8px; } strong { color: #1a1a2e; } </style> For global state, use stores:
// stores/user.ts import { writable, derived } from 'svelte/store'; export const user = writable(null); export const isLoggedIn = derived(user, $user => !!$user); // In component import { user, isLoggedIn } from '../stores/user'; $: console.log($user); // $ subscription to store Animations and transitions in Svelte
Built-in support for CSS animations:
<script> import { fade, fly, scale } from 'svelte/transition'; import { tweened } from 'svelte/motion'; let visible = true; const progress = tweened(0, { duration: 400 }); </script> {#if visible} <div transition:fly={{ y: -20, duration: 300 }}>Appearing</div> {/if} <progress value={$progress} /> Animations are declarative and require no additional libraries.
When to choose Svelte?
- Interactive widgets embedded in non-SPA sites (e.g., a cart in WordPress).
- Projects with strict bundle size requirements (browser extensions, email widgets).
- Teams that value code simplicity over ecosystem size.
- Animated and highly interactive UIs (dashboards, maps, editors).
| Characteristic | Svelte | React | Vue |
|---|---|---|---|
| Bundle size (typical widget) | 20–30 KB | 60–80 KB | 40–60 KB |
| Rendering speed | Faster (no diffing) | Medium | Medium |
| Learning curve | Low | Medium | Low |
Financial efficiency of Svelte solutions is also higher: the average cost of widget development is significantly lower than React counterparts due to less code and shorter debugging time.
How we develop frontend with Svelte
We use SvelteKit for full applications and Svelte standalone for widgets. In practice, we apply Runes, stores, and built-in animations. As a Svelte-focused development company with over 10 years of experience and more than 40 projects delivered, we guarantee quality and on-time delivery.
One of our projects was an interactive map for a real estate agency. Using Svelte, we implemented filters and animations; the bundle was 30 KB, load time reduced by 40% compared to the React version. Animations run smoothly even on devices with 2 GB of RAM.
For embedding a Svelte widget into an existing site:
- Create a standalone component.
- Build it with Vite.
- Include the resulting script on the page.
- Initialize the widget via a JavaScript API.
Example integration of a Svelte widget into WordPress: create the widget component, build with Vite into a single JS file, include the script via functions.php, and initialize the widget by selector.
What's included: stages and timelines
| Stage | What we do | Result |
|---|---|---|
| Analysis | Gather requirements, review prototypes | Technical specification |
| Design | Component architecture, routing | Diagrams, data schemas |
| Implementation | Write components in Svelte 5, configure SvelteKit | Deployed repository |
| Testing | Unit, e2e tests, Core Web Vitals check | Report |
| Deployment | Vercel, Cloudflare Pages, or your hosting | Working site |
| Support | Fixes, updates, monitoring | 3-month warranty |
Timelines. SPA or widget (5–10 screens): 1–2 weeks. Project with SvelteKit, authentication, API integration: 2–5 weeks. Maintenance savings can reach 40% compared to React projects. Cost is calculated individually after requirement analysis.
Typical mistakes in Svelte development
- Using outdated approaches (imperative DOM manipulation instead of reactivity).
- Incorrect use of
$effect(infinite loops, memory leaks). - Ignoring SvelteKit for SSR projects.
We guarantee quality and deadlines. Contact us for a free project assessment. Get a consultation on integrating Svelte into your stack.