Glossary · Web & App Development
Astro
Overview
What Astro Is
Astro is an open-source web framework for building content-focused websites—blogs, marketing sites, documentation, and storefronts—that prioritize speed. Its defining trait is shipping zero JavaScript by default: pages are rendered to static HTML, so visitors download only what they need. You can still write components in React, Vue, Svelte, or Astro's own syntax.
How the Islands Architecture Works
Astro uses an "islands" model: the page is static HTML, and only the genuinely interactive pieces—a search box, a cart widget—are hydrated with JavaScript, independently. Everything else stays lightweight. This keeps pages fast and improves Core Web Vitals, which matters for both search rankings and user experience. Astro also supports server rendering when dynamic content is required.
Why It Matters for Business
For sites where load speed and search visibility drive results—lead generation, sales funnels, ecommerce—Astro's lean output is a strong fit. We use Astro in frontend and web development projects when the goal is a fast, SEO-friendly site that's easy to maintain, pairing it with Tailwind CSS and a headless CMS for content editing.
Where we use it
Related Zen in Tech services
How our team puts Astro to work in real projects.
FAQ
Astro — common questions
Astro vs Next.js—which should I choose?
Choose Astro for content-heavy sites where speed and minimal JavaScript matter most; choose Next.js for highly interactive, app-like experiences. Astro can embed React components, so the line blurs, but the two optimize for different priorities.
Is Astro good for SEO?
Yes. Astro renders pages as static HTML and ships little JavaScript, so content is immediately available to search engines and AI crawlers, and pages tend to score well on Core Web Vitals—both of which support strong SEO.
Is Astro free?
Yes. Astro is open-source and free under the MIT license. Astro sites are static or server-rendered and can be hosted on many platforms, including free tiers from providers like Netlify, Vercel, and Cloudflare Pages.
Need Astro done right?
Book a free consultation and we’ll map the fastest, most cost-effective path for your project.
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