Astro vs Next.js: Which One Does Your Website Need?
Astro and Next.js solve different problems. The deciding factor is whether you are publishing content or running an application.
Astro and Next.js get compared as if they were competing for the same job. They are not. Next.js is an application framework that renders content very well. Astro is a content framework that adds interactivity where it is needed. Choosing correctly is mostly a matter of deciding which description matches your project.
The short version
- Choose Astro when the site's job is to publish content: marketing pages, blogs, documentation, landing pages.
- Choose Next.js when the site's job includes accounts, dashboards, server-side logic, payments, or a real API layer.
- If you cannot tell which one you have, the test in the next section usually settles it.
The test: content or application?
Write down what happens after someone clicks your primary call to action. If the answer is “they read something, then fill in a form”, you have a content site. If the answer is “they log in, and what they see depends on who they are”, you have an application.
Most marketing websites are content sites with one form. They do not need an application framework, and the cost of using one is not a licence fee — it is the build pipeline, the dependency surface, and the deployment complexity you maintain forever.
JavaScript payload
Astro renders to HTML by default and ships no JavaScript for a component unless you explicitly ask for it, using islands for the parts that genuinely need interactivity. Next.js ships a React runtime; the App Router and Server Components have cut this down considerably, but the baseline is still higher than a static Astro page.
On a marketing site that difference shows up as mobile performance, which shows up as conversion rate on paid traffic. On an application it barely matters, because you needed the runtime anyway.
Rendering and hosting
Astro defaults to static output you can host almost anywhere, with server rendering available when you want it. Next.js assumes a server, or a platform that provides one — an advantage when you need server logic and an operational cost when you do not.
Ask one question: does any page need to be different per request? If no page does, static output is simpler, cheaper, and much harder to break.
CMS and content
Both integrate well with a headless CMS such as Sanity, and both handle structured content properly. The difference is emphasis. Astro's content collections make typed local content and Markdown a first-class path, which suits editorial and documentation sites. Next.js treats the CMS as one data source among several, which suits products where marketing content sits next to user data. Both are in regular use here, as listed on the technologies page.
Where Next.js is clearly right
- Authenticated areas, user dashboards, and role-based views
- Payments, subscriptions, and server-side business logic
- An API layer the frontend owns
- Real-time or per-user data rendered on the page
- A product where the marketing site and the app share a codebase and design system
That is the shape of most web application work, and it is a genuinely different project from a marketing site.
Where Astro is clearly right
- A marketing site with a blog that publishes regularly
- Documentation and other content-heavy sites
- Landing pages where mobile performance is a direct paid-traffic cost
- Teams that want the smallest possible maintenance surface
- Migrations away from a heavy stack that was never needed in the first place
The case for running both
Nothing requires a single answer. A common and sensible setup is a product built with Next.js and a separate Astro marketing site on the same domain. Content publishing then never touches the product deploy, marketing pages stay fast, and the two teams stop waiting on each other. The cost is two codebases and a shared design system to keep in sync, which is worth it above a certain publishing frequency and wasteful below it.
How to decide this week
- List every page that must differ per visitor. If that list is empty, start with Astro.
- List every integration that needs a secret key on a server. If that list is empty, you do not need a server framework.
- Estimate publishing frequency. Frequent publishing means the CMS and the editor experience matter more than the framework.
- Ask who maintains this in a year. The smaller surface usually wins.
The wrong choice is recoverable, but it is not free: it means a migration, a redirect map, and re-testing everything. That is worth twenty minutes of honest description up front, and it is the same exercise as choosing the stack for a marketing website.