Astro
Static Site Generator
SEO Friendliness
Performance
Ecosystem
Primary Rendering
SSG, Partial Hydration
Best Use Case
Perfect for high-performance, content-heavy sites where SEO is critical.
Key SEO Considerations
A content-driven web framework designed for building the world's fastest websites.
Its defining feature is "Islands Architecture," rendering pages with zero client-side JavaScript by default.
It is framework-agnostic, allowing you to use components from React, Vue, Svelte, and more.
This "HTML-first, JS-optional" approach results in unparalleled performance and Core Web Vitals scores.
Best suited for content-rich sites, not complex, state-intensive web applications.
Core Architecture
The Web Framework for Content-Driven Websites
Astro is designed for building fast, content-driven sites like blogs and marketing pages. Its core philosophy is to deliver the best performance by sending as little JavaScript as possible. It is UI-framework-agnostic, allowing you to use React, Vue, Svelte, etc., components side-by-side.
Islands Architecture
Zero JS by Default
Astro's key innovation is "Islands Architecture." It renders pages to static HTML, and then "hydrates" only the specific interactive components ("islands") that require JavaScript. This "zero JS by default" approach leads to world-class performance and exceptional Core Web Vitals scores, a major SEO advantage.
SEO Implementation
Simple and Effective
SEO is managed through a layout-based system, where a base layout component accepts props like title and description to populate head tags. The official @astrojs/sitemap integration automates sitemap generation.
Hydrating Islands
Astro gives fine-grained control over when interactive components load JavaScript using client directives like client:visible (hydrates when the component enters the viewport), keeping the JS footprint to an absolute minimum.
Actionable Recommendations
- Choose Astro when the primary goal is to deliver content quickly and efficiently.
- Think in "islands": build static HTML first, then identify the minimal components that need to be interactive.
- Leverage the official integrations for common tasks like sitemaps.
- Use Content Collections for any site with Markdown or MDX-based content to ensure it is structured and type-safe.
Ready to build with Astro?
Explore more framework guides and SEO resources to make the right choice for your project.