Best Static Site Generators in 2026: Astro vs Next.js vs Eleventy

TL;DR

Astro for content sites; Next.js for hybrid apps; Eleventy for pure simplicity. Astro (~2M weekly downloads) pioneered Islands Architecture — ship zero JavaScript by default, hydrate only interactive components. Next.js (~9M) is the SSG + SSR powerhouse with App Router. Eleventy (~200K) is the purist's choice — no build overhead, any template language, pure HTML output. For blogs, docs, and marketing sites in 2026, Astro is the fastest-growing and most compelling choice.

Key Takeaways

• Next.js: ~9M weekly downloads — SSG + SSR + edge, App Router, Vercel-native
• Astro: ~2M downloads — Islands Architecture, framework-agnostic components, fastest builds
• Eleventy: ~200K downloads — zero framework lock-in, fastest build times, pure HTML
• Gatsby — effectively in maintenance mode (Netlify acquisition, low activity)
• Astro Content Collections — typed content with Zod schemas, best-in-class DX

---

Astro (Islands Architecture)

---
// src/pages/blog/[slug].astro — static page generation
import { getCollection, getEntry } from 'astro:content';
import Layout from '@/layouts/Layout.astro';
import type { GetStaticPaths } from 'astro';

export const getStaticPaths: GetStaticPaths = async () => {
  const posts = await getCollection('blog');
  return posts.map((post) => ({
    params: { slug: post.slug },
    props: { post },
  }));
};

const { post } = Astro.props;
const { Content, headings } = await post.render();
---

<Layout title={post.data.title} description={post.data.description}>
  <article>
    <h1>{post.data.title}</h1>
    <time>{post.data.publishedAt.toLocaleDateString()}</time>
    <!-- Zero JS shipped for content -->
    <Content />
  </article>
  <!-- This React component ONLY hydrates when visible -->
  <TableOfContents headings={headings} client:visible />
</Layout>

// Astro Content Collections — typed content with Zod
// src/content/config.ts
import { defineCollection, z } from 'astro:content';

const blog = defineCollection({
  type: 'content',  // markdown/mdx files
  schema: z.object({
    title: z.string(),
    description: z.string(),
    publishedAt: z.coerce.date(),
    author: z.string(),
    tags: z.array(z.string()).default([]),
    featured: z.boolean().default(false),
    image: z.object({
      src: z.string(),
      alt: z.string(),
    }).optional(),
  }),
});

export const collections = { blog };

---
// Islands Architecture — selective hydration
import HeavyChart from '../components/HeavyChart.jsx';
import SearchBar from '../components/SearchBar.react.tsx';
import VideoPlayer from '../components/VideoPlayer.vue';
---

<!-- Static HTML — no JS shipped -->
<HeavyChart data={chartData} />

<!-- Hydrate immediately when JS loads -->
<SearchBar client:load />

<!-- Hydrate only when component enters viewport -->
<HeavyChart data={chartData} client:visible />

<!-- Hydrate only when browser is idle -->
<VideoPlayer src={videoUrl} client:idle />

<!-- Never hydrate (server-render only, even with props) -->
<StaticMap coordinates={coords} client:only="react" />

# Astro — framework-agnostic
# Mix React, Vue, Svelte in the same project
npm install @astrojs/react @astrojs/vue @astrojs/svelte

---

Next.js (Full Power SSG)

// Next.js App Router — static generation
// app/blog/[slug]/page.tsx
import { getPostBySlug, getAllPosts } from '@/lib/blog';
import { notFound } from 'next/navigation';
import { MDXRemote } from 'next-mdx-remote/rsc';

export async function generateStaticParams() {
  const posts = await getAllPosts();
  return posts.map((post) => ({ slug: post.slug }));
}

export async function generateMetadata({ params }: { params: { slug: string } }) {
  const post = await getPostBySlug(params.slug);
  return {
    title: post.title,
    description: post.description,
    openGraph: { images: [post.image] },
  };
}

export default async function PostPage({ params }: { params: { slug: string } }) {
  const post = await getPostBySlug(params.slug);
  if (!post) notFound();

  return (
    <article>
      <h1>{post.title}</h1>
      <MDXRemote source={post.content} />
    </article>
  );
}

---

Eleventy (Pure Simplicity)

// .eleventy.js — minimal config
module.exports = function(eleventyConfig) {
  // Add custom filters
  eleventyConfig.addFilter('dateFormat', (date) => {
    return date.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' });
  });

  // Collections
  eleventyConfig.addCollection('posts', (collection) => {
    return collection.getFilteredByGlob('src/blog/**/*.md')
      .sort((a, b) => b.date - a.date);
  });

  // Passthrough copy (static assets)
  eleventyConfig.addPassthroughCopy('src/static');

  return {
    dir: {
      input: 'src',
      output: '_site',
    },
  };
};

---
title: My Blog Post
date: 2026-03-08
tags: [javascript, web]
layout: post.njk
---

Write your Markdown here.
Eleventy supports Nunjucks, Liquid, Handlebars, HTML, JS — any template language.

---

Build Performance

SSG	1K pages	10K pages	Hot reload
Eleventy	~1s	~10s	Instant
Astro	~3s	~25s	Fast
Next.js (SSG)	~8s	~60s	Fast (turbopack)
Gatsby	~15s	~120s+	Slow

---

When to Choose

Scenario	Pick
Blog, docs, marketing site	Astro
Mix of static + dynamic routes	Next.js
Zero JS, maximum simplicity	Eleventy
App + marketing site (one codebase)	Next.js
Mix React/Vue/Svelte components	Astro
Largest CMS ecosystem	Next.js
Personal site, no build overhead	Eleventy
E-commerce (ISR + edge)	Next.js

---

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