Astro vs Next.js — When to Use Which

Astro and Next.js serve different purposes. Understanding the differences helps you choose right.

• Astro vs Next.js — When to Use Which
• Architecture
• When to Use Next.js
• When to Use Astro
• JavaScript Performance
• Content Collections
• Component Islands
• Deployment
• FAQ

Architecture

Next.js:

• React-based
• Full-stack JavaScript
• Server Components
• Dynamic by default

Astro:

• Framework agnostic
• Zero JavaScript by default
• Static-first
• Island architecture

When to Use Next.js

Build interactive web applications:

export default function Dashboard() {
  const [count, setCount] = useState(0)

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

Perfect for:

• Interactive dashboards
• Real-time apps
• Complex state
• Single Page Apps

When to Use Astro

Build static sites with islands of interactivity:

---
const posts = await db.posts.findMany()
---

<main>
  <h1>Blog</h1>
  {posts.map(post => (
    <article>
      <h2>{post.title}</h2>
      <p>{post.excerpt}</p>
    </article>
  ))}
  <SearchComponent client:load />
</main>

Perfect for:

• Marketing sites
• Documentation
• Blogs
• Static content sites

JavaScript Performance

Next.js: Ships React to browser (minimum ~35KB)

Astro: Ships zero JavaScript by default (lightweight components opt-in)

Content Collections

Astro:

---
import { getCollection } from 'astro:content'

const posts = await getCollection('blog')
---

{posts.map(post => (
  <a href={post.slug}>{post.data.title}</a>
))}

Next.js:

import { prisma } from '@/lib/prisma'

export async function getPosts() {
  return await prisma.posts.findMany()
}

Component Islands

Astro loads interactive components only where needed:

<SearchBar client:load />
<Sidebar client:idle />
<Modal client:visible />

Next.js requires 'use client' for entire component tree.

Deployment

Next.js: Best on Vercel, works on any Node host

Astro: Truly static output, deploys anywhere (Netlify, Vercel, GitHub Pages)

FAQ

Q: Can I use React with Astro? A: Yes, as island components.

Q: Can I use Astro for a SPA? A: Not recommended. Use Next.js for SPAs.

Q: Which is faster? A: Astro for static sites (less JS). Next.js for interactive apps.

Choose Astro for content, Next.js for applications.