Astro vs Next.js: When SSG beats React for content sites

When choosing between Astro and Next.js for a content-heavy site, the decision is less about capability and more about runtime efficiency, with Astro being more suitable for static content and Next.js for dynamic applications. Astro emphasizes minimal JavaScript by default, using its island architecture to introduce interactivity only where necessary, resulting in static content pages often shipping 0 KB of JavaScript. In contrast, Next.js, a React framework, includes a React runtime on every page, leading to a non-trivial JavaScript bundle even for static pages. The two frameworks were compared by building a minimal tech blog, revealing that Astro's model is more efficient for static sites, with zero JavaScript for non-interactive content, while Next.js, although capable of incremental static regeneration, inherently involves React even in simple setups. This makes Astro a better fit for projects where content is the primary product, such as blogs or documentation, and Next.js more appropriate for applications requiring real-time data or authentication.

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