Svelte and Solid.js in 2025: The React Alternatives Developers Are Migrating To

React dominated for 10 years. But in 2025, something changed: developers are abandoning React en masse for frameworks that are faster, simpler and less "magical".

The names? Svelte 5 and Solid.js.

The numbers?

• Svelte: +340% adoption in 2024-2025
• Solid.js: Fastest-growing framework in satisfaction (State of JS 2024)
• React: Still leader, but losing 15% market share to alternatives

The question every dev is asking: "Should I migrate from React?"

Let's explore real data, performance benchmarks and when it's worth (or not) switching.

🎯 Why Are Developers Fleeing React?

1. Growing Complexity

React in 2025 became a maze of concepts:

// Modern React = lots of hidden magic
import { useState, useEffect, useMemo, useCallback, useRef } from 'react';

function UserProfile({ userId }) {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);
  const prevUserId = useRef();

  // useEffect for fetch
  useEffect(() => {
    if (userId !== prevUserId.current) {
      setLoading(true);
      fetchUser(userId).then(data => {
        setUser(data);
        setLoading(false);
      });
      prevUserId.current = userId;
    }
  }, [userId]);

  // useMemo to avoid re-renders
  const displayName = useMemo(() => {
    return user ? `${user.firstName} ${user.lastName}` : '';
  }, [user]);

  // useCallback to memoize function
  const handleUpdate = useCallback(() => {
    updateUser(user.id, { ... });
  }, [user]);

  if (loading) return <Spinner />;

  return (
    <div>
      <h1>{displayName}</h1>
      <button onClick={handleUpdate}>Update</button>
    </div>
  );
}

Problems:

• 5 different hooks for simple task
• "Rules of hooks" that confuse beginners
• Performance depends on you "memoizing correctly"
• Hard to debug when something breaks

2. Mediocre Performance by Default

React re-renders entire components even when only 1 value changed:

// Only "count" changed, but WHOLE component re-renders
function App() {
  const [count, setCount] = useState(0);
  const [user, setUser] = useState({ name: 'Jeff', age: 30 });

  console.log('Component re-rendered!'); // Fires every time!

  return (
    <div>
      <h1>Count: {count}</h1>
      <h2>User: {user.name}</h2>
      <button onClick={() => setCount(count + 1)}>+1</button>
    </div>
  );
}

Result: Large apps become slow without manual optimization (memo, useMemo, useCallback).

3. Large Bundle Size

# Bundle sizes (simple app, minified + gzipped):
React 18 + ReactDOM:  45 KB
Svelte 5:              4 KB  # 10x smaller!
Solid.js:              7 KB  # 6x smaller!

Impact: Svelte/Solid sites load much faster, especially on mobile 3G.

⚡ Svelte 5: "Less Code, More Results"

Philosophy: Compiler > Runtime

Svelte compiles your code to optimized vanilla JavaScript. No virtual DOM, no framework running in browser.

Example: Same Component in React vs Svelte

React:

import { useState, useEffect } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  useEffect(() => {
    document.title = `Count: ${count}`;
  }, [count]);

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>+1</button>
    </div>
  );
}

Svelte:

<script>
  let count = 0;

  $: document.title = `Count: ${count}`;
</script>

<div>
  <p>Count: {count}</p>
  <button on:click={() => count++}>+1</button>
</div>

Brutal differences:

Aspect	React	Svelte
Lines of code	14	10 (-30%)
Imports needed	2	0
Hooks	2	0
Readability	Good	Excellent
Bundle size	~45KB	~4KB

Svelte 5: Runes (The Big Change)

Svelte 5 introduced runes — a more explicit form of reactivity:

<script>
  // Before (Svelte 4): too magical?
  let count = 0;
  $: doubled = count * 2;

  // Now (Svelte 5): more explicit
  let count = $state(0);
  let doubled = $derived(count * 2);

  function increment() {
    count++;
  }
</script>

<button on:click={increment}>
  Count: {count}, Doubled: {doubled}
</button>

Benefits:

• Less "magic" (easier to understand)
• Better type-safety (TypeScript)
• Even better performance

Performance: Svelte vs React

Benchmark (JS Framework Benchmark 2025):

Test	React 18	Svelte 5	Winner
Create 1,000 rows	38ms	22ms	Svelte (42% faster)
Update 1,000 rows	45ms	15ms	Svelte (67% faster)
Remove 1,000 rows	25ms	10ms	Svelte (60% faster)
Memory used	3.2 MB	1.8 MB	Svelte (44% less)
Bundle size	45 KB	4 KB	Svelte (91% smaller)

Source: JS Framework Benchmark

When to Use Svelte:

✅ New projects (greenfield)
✅ Content sites (blogs, landing pages)
✅ Small/medium apps
✅ Performance critical (mobile, 3G)
✅ Small teams (less code = less maintenance)

❌ Giant apps with consolidated React ecosystem
❌ When you need React-specific libraries

🚀 Solid.js: "Svelte Performance + React JSX"

Philosophy: Fine-Grained Reactivity

Solid.js updates only what changed, not the entire component:

import { createSignal } from 'solid-js';

function Counter() {
  const [count, setCount] = createSignal(0);

  console.log('Component runs ONCE!'); // Only at creation

  return (
    <div>
      <p>Count: {count()}</p>
      <button onClick={() => setCount(count() + 1)}>+1</button>
    </div>
  );
}

Magic: When count changes, Solid updates only the <p> text, doesn't re-run entire component.

React: Re-runs whole component (inefficient).
Solid: Updates only necessary DOM (efficient).

Advanced Example: Automatic Derivations

import { createSignal, createMemo } from 'solid-js';

function ShoppingCart() {
  const [items, setItems] = createSignal([
    { name: 'Laptop', price: 1200 },
    { name: 'Mouse', price: 25 }
  ]);

  // createMemo = computed value (auto-updates)
  const total = createMemo(() =>
    items().reduce((sum, item) => sum + item.price, 0)
  );

  const addItem = () => {
    setItems([...items(), { name: 'Keyboard', price: 75 }]);
  };

  return (
    <div>
      <ul>
        <For each={items()}>
          {(item) => <li>{item.name}: ${item.price}</li>}
        </For>
      </ul>

      <p>Total: ${total()}</p>
      <button onClick={addItem}>Add Keyboard</button>
    </div>
  );
}

What happens when you click "Add Keyboard":

1. items updates
2. total automatically recalculates (depends on items)
3. Only the list and total in DOM update
4. Rest of component doesn't re-execute

React: Would re-render everything, would need useMemo.

Performance: Solid.js vs React

Benchmark (JS Framework Benchmark 2025):

Test	React 18	Solid.js	Winner
Create 1,000 rows	38ms	18ms	Solid (53% faster)
Update 1,000 rows	45ms	12ms	Solid (73% faster)
Remove 1,000 rows	25ms	9ms	Solid (64% faster)
Memory used	3.2 MB	1.5 MB	Solid (53% less)
Bundle size	45 KB	7 KB	Solid (84% smaller)

Solid is the fastest framework in its category (including Svelte!).

Brutal Difference: JSX without Virtual DOM

Solid uses JSX (like React), but compiles to direct DOM updates:

// Looks like React, but is MUCH faster
function TodoList({ todos }) {
  return (
    <ul>
      <For each={todos}>
        {(todo) => <li>{todo.text}</li>}
      </For>
    </ul>
  );
}

React: Creates virtual DOM tree, diffs, applies changes.
Solid: Compiles to document.createElement + optimized event listeners.

When to Use Solid.js:

✅ Performance is priority #1
✅ You like JSX (don't want to learn new syntax)
✅ Data-intensive apps (dashboards, large tables)
✅ Want to migrate from React (similar syntax)

❌ Need giant ecosystem (fewer libs than React)
❌ Team doesn't know fine-grained reactivity (learning curve)

📊 Direct Comparison: React vs Svelte vs Solid

Complete Table:

Criteria	React 18	Svelte 5	Solid.js	Winner
Performance	⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	Solid
Bundle Size	45 KB	4 KB	7 KB	Svelte
DX (Dev Experience)	⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	Svelte
Learning Curve	Medium	Low	Medium	Svelte
Ecosystem	⭐⭐⭐⭐⭐	⭐⭐⭐	⭐⭐	React
Community	Gigantic	Large	Growing	React
Job Openings	Many	Few	Rare	React
TypeScript	⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	Solid
SSR	⭐⭐⭐⭐ (Next.js)	⭐⭐⭐⭐⭐ (SvelteKit)	⭐⭐⭐⭐ (Solid Start)	Svelte
Mobile	⭐⭐⭐⭐ (React Native)	⭐⭐ (Svelte Native)	❌	React

Migration from React: Side-by-Side Examples

1. Simple State:

// React
const [count, setCount] = useState(0);
setCount(count + 1);

// Svelte
let count = $state(0);
count++;

// Solid
const [count, setCount] = createSignal(0);
setCount(count() + 1);

2. Side Effects:

// React
useEffect(() => {
  console.log('Count changed:', count);
}, [count]);

// Svelte
$: console.log('Count changed:', count);

// Solid
createEffect(() => {
  console.log('Count changed:', count());
});

3. Computed Values:

// React
const doubled = useMemo(() => count * 2, [count]);

// Svelte
let doubled = $derived(count * 2);

// Solid
const doubled = createMemo(() => count() * 2);

💰 Real Migration Cases

1. The New York Times (Svelte)

Before: React
After: Svelte (for interactive pages)

Results:

• 60% reduction in JavaScript
• 40% faster First Contentful Paint
• 30% less infrastructure cost (CDN)

2. Cloudflare Dashboard (Solid.js)

Before: React + Redux
After: Solid.js + Solid Store

Results:

• 70% faster on large tables (10k+ rows)
• 50% less memory used
• 85% reduction in bundle size

3. 1Password (Svelte)

Migration: React → Svelte (web app)

Results:

• 3x faster in UI operations
• 50% less code total
• 70% fewer bugs (simpler code)

⚠️ When NOT to Migrate

1. Large Production App

Migrating giant React app is risky and expensive:

• Months of work
• Inevitable bugs
• Team needs to learn new framework
• Questionable ROI

Alternative: Use Svelte/Solid in new features (micro-frontends).

2. Dependency on React-Only Libs

Libraries without alternatives:

• React Native (mobile)
• React Three Fiber (3D)
• Some UI libs (Chakra, Radix)

Solid has JSX, so many libs work. Svelte needs ports.

3. Team Doesn't Want to Learn

If your team is happy with React and productive, migrating might worsen the situation.

Rule: Only migrate if gain is very obvious.

🎓 How to Get Started with Svelte/Solid

Svelte 5: Quick Start

# Create Svelte project with SvelteKit (SSR included)
npm create svelte@latest my-app
cd my-app
npm install
npm run dev

First component (Counter.svelte):

<script>
  let count = $state(0);

  function increment() {
    count++;
  }
</script>

<button on:click={increment}>
  Count: {count}
</button>

<style>
  button {
    font-size: 1.5rem;
    padding: 1rem 2rem;
    background: #ff3e00;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
  }
</style>

Solid.js: Quick Start

# Create Solid project (Vite template)
npx degit solidjs/templates/ts my-app
cd my-app
npm install
npm run dev

First component (Counter.tsx):

import { createSignal } from 'solid-js';
import './Counter.css';

function Counter() {
  const [count, setCount] = createSignal(0);

  return (
    <button onClick={() => setCount(count() + 1)}>
      Count: {count()}
    </button>
  );
}

export default Counter;

🔥 Predictions for 2025-2026

1. Will Svelte Surpass Vue?

Possible. Svelte growth rate is higher than Vue:

• Vue: stable (~10% market share)
• Svelte: growing 40% annually

2026 Projection: Svelte = 12%, Vue = 11%.

2. Solid Will Be "Next Svelte"

Likely. Dev satisfaction is very high (95%+).

Problem: Small ecosystem still.

3. Will React Fall Below 50%?

Unlikely (short term). React still dominates:

• 70% market share (2025)
• Job openings (90%+ ask for React)

But trend is falling to ~60% by 2027.

💡 My Recommendation (Honest)

For New Projects:

• Svelte 5: If you want simplicity + performance
• Solid.js: If you want maximum performance + JSX
• React: If you need giant ecosystem + jobs

For Existing Apps:

• Don't migrate large app (low ROI)
• Use Svelte/Solid in new features (test the waters)
• Consider migration if app is small AND performance is critical

For Learning:

Learn Svelte first:

• Easier than Solid
• Teaches reactivity concepts
• Fun to use (you'll enjoy it!)

Then, try Solid if you want extreme performance.

🎯 Conclusion: React's Monopoly Era is Over

React still dominates, but it's no longer the only viable option.

Svelte and Solid proved:

• Performance matters
• DX matters
• Less code is better

The choice is yours:

• Want to play it safe? React.
• Want to innovate? Svelte.
• Want brutal performance? Solid.

My bet: In 5 years, we'll have 3-4 frameworks with balanced market share. React monoculture is ending. 🚀

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Have you tried Svelte or Solid? Share your experience! 👇