Eleventy is the minimalist’s static site generator — no bundler imposed, no JavaScript framework required, eleven templating languages supported. Astro is more opinionated, ships a full build pipeline, and has opinions about performance that Eleventy deliberately avoids having. Here’s an honest comparison, including one important clarification: the choice between these two tools is a developer decision, not a client decision. Understanding the implications for your site, however, is very much a business owner’s concern.
The Core Philosophy Difference
Eleventy (11ty) was created by Zach Leatherman in 2018 with an explicit anti-opinion. It does as little as possible. No JavaScript bundler. No prescribed component model. No mandatory build tooling. You give Eleventy content in any of eleven supported template formats (Markdown, Nunjucks, Liquid, HTML, JavaScript, Handlebars, and more), and it outputs static HTML. What you do with assets, client-side JavaScript, and build tooling is entirely your problem.
This is genuinely useful in some scenarios and genuinely frustrating in others.
Astro was built with an opinion: JavaScript in the browser is a performance problem, and the framework should minimize it automatically. The islands architecture means interactive components are isolated and lazy-loaded. The build pipeline (Vite-based) handles bundling, optimization, and code splitting. Astro generates static HTML by default, like Eleventy, but with a much more complete tooling story.
Neither philosophy is wrong. They’re solving slightly different problems.
Who Uses Each Tool
Eleventy’s user base is heavily developer-centric. It powers high-profile developer documentation sites, personal developer blogs, and design systems documentation. The Eleventy community skews toward developers who want explicit control over every aspect of their build. It’s the “I’ll configure my own bundler” crowd.
Notable sites on Eleventy: web.dev (Google’s web development resource site), the US Web Design System documentation, and a large portion of developer-owned personal sites and blogs.
Astro’s adoption is broader. It’s used for developer sites, marketing sites for funded startups, documentation sites, blogs, and increasingly for business marketing sites. The Astro community is larger and growing faster — by Stars on GitHub, downloads per week on npm, and community Discord membership.
This matters for a business because it affects the talent pool for future maintenance and development. More Astro developers exist in 2026 than Eleventy developers, and the gap is widening.
Performance: Theory vs. Practice
Both Eleventy and Astro output static HTML. Both can achieve 100/100 Lighthouse scores. The question is how much work it takes to get there.
Eleventy gives you a performance ceiling that’s as high as you want — but it doesn’t help you reach it. If you need client-side JavaScript for interactive components, you’re adding it manually. Code splitting, lazy loading, bundle optimization — you configure these yourself, using whichever bundler you choose to bolt on.
For developers who know what they’re doing, this is fine. For teams with varying experience levels, it means performance is as good as the least experienced person on the team remembered to optimize.
Astro’s islands architecture enforces a performance floor. Interactive components are isolated by design. Only the JavaScript for visible interactive elements loads. Bundle optimization happens automatically via Vite. A developer who makes a performance mistake in an Astro component is contained to that component — it doesn’t affect the whole page.
In practice, well-built Eleventy sites and well-built Astro sites score identically on Lighthouse. The difference is that Astro makes “well-built” the default path. For a business where the developer who builds the site may not be the developer who maintains it in two years, that enforced performance floor matters.
The Astro performance benchmarks and SEO data covers the specific numbers if you want the Lighthouse comparison with real site data.
Developer Experience: Build Speed and Tooling
Eleventy builds are fast — very fast. A large content site (1,000+ pages) often builds in under 5 seconds. Eleventy’s simplicity means there’s less to process.
Astro builds are also fast. Vite’s hot module replacement makes development iteration immediate. For most business sites under 500 pages, Astro build times are 5–15 seconds — fast enough that they’re not a constraint.
Where Eleventy wins on developer experience: flexibility. If your project has unusual requirements — a custom data pipeline, a non-standard templating approach, tight integration with a legacy system — Eleventy’s lack of opinions means you can wire it however you need to.
Where Astro wins: out-of-the-box completeness. TypeScript support, framework integrations (React, Vue, Svelte), image optimization, CSS modules, Tailwind CSS integration — all available without configuration. With Eleventy, each of these is a separate setup decision.
For a developer starting a new project today, Astro’s developer experience is objectively more productive for most business site use cases. For a developer with a specific non-standard requirement, Eleventy’s flexibility may be the right call.
Component Model and JavaScript Framework Support
Eleventy doesn’t have a component model. It has templates. If you want React or Vue components, you need to configure Webpack or Vite yourself and integrate them into Eleventy’s build. It works, but it’s setup.
Astro has native support for React, Vue, Svelte, Solid, and Preact as first-class integrations. Adding one is npx astro add react — a 30-second operation. Components from any of these frameworks can coexist in the same Astro project.
Astro also has its own .astro component syntax, which outputs zero JavaScript by default — it’s HTML with slots and frontmatter. When you need a React component for a specific interactive feature, you use React for that component only.
For a business site that might need a React-based interactive tool, a Vue-based filtering component, or a Svelte animation, Astro handles this cleanly. In Eleventy, adding any of these requires a more involved setup.
This is primarily a developer concern, but it has business implications: Astro makes future feature additions more predictable in scope and cost than Eleventy does.
Content Management: Both Have the Same Gap
Neither Eleventy nor Astro ships with a content editing interface. Both have the same answer: use a headless CMS.
The headless CMS integration story is better in Astro — more official integrations, better documentation, more community examples. Eleventy integrations exist but are often third-party maintained and less consistently updated.
For a business with a non-technical content team, both Eleventy and Astro require a headless CMS as a separate system. Sanity, Contentful, Prismic, and Storyblok all work with both. The choice of CMS matters more than the choice of framework for the content editing experience.
If a native content editing experience is essential, WordPress remains the more practical choice. The Astro vs WordPress business comparison covers this decision honestly, including the cases where WordPress is the right answer.
The Maintenance Reality
Eleventy’s simplicity cuts both ways on maintenance.
On the plus side: fewer dependencies, less to break, simpler mental model. An Eleventy site from 2020 is generally still buildable today with minimal changes. The framework doesn’t churn.
On the minus side: because Eleventy doesn’t prescribe tooling, every Eleventy project looks different. The build configuration, the bundler setup, the CSS approach — all vary by developer. A new developer inheriting an Eleventy project has to read a lot of custom configuration before they can work confidently.
Astro projects have more consistency. The configuration is in astro.config.mjs, components follow the .astro format, integrations are official. A developer familiar with Astro can get oriented in a new Astro project faster than in an arbitrary Eleventy setup.
For a business concerned about developer continuity — what happens when the person who built the site isn’t available? — Astro’s consistency is a real advantage.
When Eleventy Is the Right Call
Eleventy wins clearly in a few specific scenarios.
Developer-controlled sites with unusual technical requirements. If you need a custom data pipeline, a non-standard build step, or tight integration with something Astro doesn’t support natively, Eleventy’s flexibility is the point. Astro’s opinions can become constraints on non-standard projects.
Extremely simple sites with no JavaScript needed. A pure HTML/CSS site with no interactive components has no need for Astro’s JavaScript optimization features. Eleventy’s minimal overhead is more appropriate. Adding Astro to a site that will never use its core feature (JavaScript islands) is installing a tool you don’t need.
Projects where developer preference matters. Developers who know Eleventy deeply, have a set of optimized patterns, and build Eleventy sites efficiently are often better served by sticking with the tool they know. Astro’s modern tooling doesn’t outweigh the productivity cost of learning a new framework if the output for a specific project type would be identical.
Sites that need to live forever without maintenance. Eleventy’s minimal dependencies and lack of a bundler mean a static Eleventy site is very unlikely to break in 5 years without updates. Astro’s Vite dependency and npm ecosystem mean node version compatibility can become an issue on a long-untouched project.
When Astro Is the Right Call
For most new business sites in 2026, Astro is the stronger choice.
The performance floor is better-enforced. JavaScript framework integrations are seamless. The ecosystem is growing and well-maintained. TypeScript support, image optimization, and build tooling are included without configuration.
If the site will have any interactive components, any headless CMS integration, any team of developers working on it over time — Astro’s consistency and completeness provide a better foundation than Eleventy.
For business owners comparing Astro to WordPress rather than Astro to Eleventy, the when to choose Astro over WordPress post is a more relevant comparison.
The Decision Framework
Here’s a direct framework for thinking through the choice:
The site is primarily marketing pages with minimal JavaScript, and it will be maintained by one developer with strong Eleventy experience. → Eleventy.
The site needs interactive components, a headless CMS integration, or multiple developers working on it. → Astro.
The site will be maintained by a team that may change over time. → Astro (more consistent architecture, better documentation, larger talent pool).
The site is documentation for a developer tool and will be hosted on GitHub Pages for free. → Eleventy (simpler deployment, deep GitHub Pages support).
The site needs to scale to 10,000+ pages and build times matter. → Eleventy has a slight edge on raw build speed, but Astro’s incremental builds close the gap significantly.
The Client Question
One more thing worth naming directly: business owners shouldn’t be choosing between Astro and Eleventy. You should be choosing between developers and agencies.
The question “should we use Astro or Eleventy?” is like asking “should we use Redux or Zustand?” It’s a technical implementation decision that belongs with the development team. What you should be evaluating: what’s the performance commitment, what’s the content editing workflow, what does maintenance look like, and what happens when you need to add features in 3 years?
Those questions have answers that require knowing the framework choice — but the framework choice itself should follow from the answers to those questions, not precede them.
An agency or developer who leads with the framework rather than the outcomes is organizing their pitch around what they prefer to build, not what your business needs. Ask about Lighthouse score commitments, content editing workflows, and developer handoff processes. The framework will follow.
Frequently Asked Questions
Is Eleventy dead or declining? No. Eleventy is actively maintained by Zach Leatherman, who joined Netlify in 2020 to work on it full time. Eleventy 3.0 was released in 2024. It has a passionate, if smaller, community. It’s not growing as fast as Astro, but it’s a maintained, production-ready tool.
Can Astro and Eleventy be used for the same types of projects? For most business site use cases, yes. Both generate static HTML, both support headless CMS integrations, both can achieve identical performance results. The differences are in developer experience, built-in tooling, and ecosystem size.
Which has better SEO capabilities? Both generate static HTML, which is optimal for SEO. The SEO difference is in execution: Astro makes it easier to add meta tags, structured data, and correct hreflang tags through component-based layouts. Eleventy can do all of this but requires more manual implementation. For a detailed look at Astro’s SEO features, the Astro JS SEO capabilities post covers the specifics.
How do Astro and Eleventy compare on bundle size? Eleventy generates zero JavaScript by default — no bundler, no framework overhead. Astro also generates near-zero JavaScript for static pages through its islands architecture. For a purely static page, both output essentially the same HTML. The difference appears when you add interactive components: Astro’s islands approach loads only the JS for each component, while Eleventy requires you to handle this optimization yourself.
Is Astro or Eleventy better for a blog? Both are excellent for blogs. Astro has a slight advantage in developer experience for blogs with interactive features (search, filtering, comments). Eleventy has a slight advantage in raw simplicity for pure Markdown-to-HTML blogs. Neither is a clearly superior choice for a basic blog use case.
What about migrating an Eleventy site to Astro?
Markdown content moves cleanly — Astro supports the same frontmatter conventions. Template logic needs to be rewritten in .astro syntax. For a small site (under 30 pages), a developer familiar with both frameworks can complete the migration in 1–2 days.
If you’re evaluating static site frameworks for a business site and need an honest recommendation based on your specific requirements, our custom WordPress development team works across WordPress, Astro, and related tooling. Our fixed-price packages include architectural recommendations with the reasoning attached.