Next.js vs Astro: App Framework or Content Site?
Next.js is a full-stack React framework for dynamic apps; Astro is a content-first framework that ships zero JS by default with islands for interactivity.
Next.js targets dynamic, interactive React applications with server rendering and a rich runtime. Astro is built for content - blogs, docs, marketing - shipping static HTML with no JavaScript unless an island needs it, and it can mix React, Vue, Svelte, and others on one page.
| Next.js | Astro | |
|---|---|---|
| Primary use | Dynamic apps | Content / marketing sites |
| Default JS | Hydrated app | Zero JS, islands opt-in |
| UI frameworks | React | React, Vue, Svelte, etc. |
| Output | SSR / SSG / edge | Static-first, SSR optional |
| Best for | App-heavy products | Fast content sites |
In CI
Astro static builds are fast and produce mostly HTML, so CI is light and cache-friendly. Next.js builds are heavier given the React runtime and routing. Choose Astro for content-dominant sites and Next.js when most of the page is a dynamic application.
Speed it up
Cache dependencies and the build output directory between runs. Both build on CI runners; faster managed runners shorten the static generation and bundling steps.
The verdict
Building a dynamic, interactive app: Next.js. Building a fast content, docs, or marketing site that should ship minimal JS: Astro. Many teams use Astro for the marketing site and Next.js for the product.