PACKAGE · META FRAMEWORK

astro

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

WEEKLY DOWNLOADS 1.6M
STARS 59.9K
FORKS 3.5K
OPEN ISSUES 200
INSTALL SIZE 92.7 MB
UNPACKED SIZE 2.8 MB
LAST UPDATED 3mo ago
DOWNLOAD TRENDS

astro downloads — last 12 months

Download trends for astro1 download series from Jun 2025 to May 2026. Use left and right arrow keys to inspect monthly values.03.2M6.3M9.5M12.6MJun 2025SepDecMarMay 2026
astro
ABOUT ASTRO

Astro is a modern site-building framework designed to deliver exceptional performance and developer experience out-of-the-box. It addresses the common challenges of over-fetching JavaScript and complex build configurations by prioritizing content-driven sites and offering an islands architecture.

Its core philosophy centers on shipping zero JavaScript by default, reducing client-side overhead. Astro enables developers to use their preferred UI frameworks like React, Vue, Svelte, or Solid within components, but these frameworks are rendered to static HTML on the server or at build time. This approach ensures maximum performance for end-users while maintaining flexibility for developers.

The framework utilizes an "islands architecture" where UI components are independently hydrated on the client. This means only the JavaScript required for interactive components is sent to the browser, dramatically improving load times. Developers can import components directly without needing complex setup, and Astro handles the rest, using its built-in adapters for various deployment targets.

Astro integrates seamlessly with existing frontend ecosystems, supporting popular UI frameworks and offering adapters for common deployment platforms like Netlify, Vercel, and Cloudflare Pages. It also works well with headless CMSs and backend services, making it suitable for a wide range of content-rich applications.

Performance is a key tenet of Astro. By shipping minimal JavaScript and supporting features like partial hydration and server-side rendering, it achieves excellent Core Web Vitals scores. The unpacked size of 2.8 MB for version 6.4.4 indicates a reasonably contained package size for its capabilities.

While powerful, Astro is primarily optimized for content-focused websites like blogs, marketing pages, and portfolios. For highly dynamic, application-heavy interfaces requiring extensive client-side interactivity across the entire page, alternative architectures might offer a more direct development path. However, Astro's flexibility in rendering components allows it to handle many such scenarios effectively.

WHEN TO USE
  • When building content-focused websites such as blogs, marketing pages, or documentation sites where SEO and fast load times are critical.
  • When you want to leverage UI frameworks like React, Vue, or Svelte without forcing client-side JavaScript for the entire page.
  • To implement an islands architecture, ensuring only interactive components hydrate on the client, reducing JavaScript payload.
  • When building static sites or hybrid rendering applications efficiently deployed to edge networks.
  • To utilize Astro's built-in routing and layout components for structured site development.
  • When aiming for top-tier Core Web Vitals scores with minimal configuration by default.
WHEN NOT TO USE
  • If your application is primarily a highly interactive single-page application (SPA) where almost every element requires client-side JavaScript for interaction, a framework focused solely on client-side rendering might be more straightforward.
  • When you need a single, unified runtime environment for complex, real-time data manipulation across the entire client-side codebase without considering hydration.
  • If you require server-side rendering for every single component and are not interested in the islands architecture's benefits for static generation.
  • For projects where the learning curve of a new site builder is a significant blocker and a simpler static site generator suffices.
  • When building applications that heavily rely on rich, real-time UIs with extensive state management requiring a full client-side JavaScript framework from the start.

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COMPARISONS 7
astro vs @builder.io/qwik ★ 22.0K · 17.1K/wk astro vs nuxt ★ 60.4K · 754.7K/wk astro vs next ★ 139.9K · 20.5M/wk astro vs solid-js ★ 35.6K · 1.3M/wk astro vs @analogjs/platform ★ 3.1K · 16.8K/wk astro vs @remix-run/react ★ 33.0K · 467.3K/wk astro vs svelte ★ 86.9K · 2.3M/wk