Astro vs Next.js for Static Sites: A Practical Comparison
We rebuilt our own site with Astro after years of Next.js. Here's what we learned about choosing the right tool for static content.
We Used Next.js for Everything (And That Was the Problem)
For years, Next.js was our default. Client project? Next.js. Internal tool? Next.js. Marketing site? Next.js. It’s a fantastic framework, but we were using a Swiss Army knife to butter toast.
When we decided to rebuild olabs.in, we took a hard look at what we actually needed: a fast static site with zero interactive widgets, good SEO, and minimal maintenance. Next.js could do all of that — but so could Astro, with a fraction of the complexity.
The Zero-JS Default Changes Everything
Astro ships zero JavaScript to the browser by default. That’s not a marketing claim — it’s the architecture. Every component renders to HTML at build time and sends nothing to the client unless you explicitly opt in.
Next.js, even with static export, bundles React and its runtime into every page. For a blog post or a services page, that’s 80-100KB of JavaScript that exists purely to hydrate components that don’t need hydration.
Here’s what we measured after rebuilding olabs.in with Astro:
| Metric | Next.js (static export) | Astro |
|---|---|---|
| Total JS shipped | ~95KB (gzipped) | 0KB (no framework JS) |
| Lighthouse Performance | 82 | 95+ |
| First Contentful Paint | 1.2s | 0.5s |
| Time to Interactive | 1.8s | 0.5s |
| Total page weight | ~180KB | ~65KB |
These aren’t synthetic benchmarks. These are real numbers from the same site, same content, same hosting provider.
Astro’s Component Model Is Surprisingly Practical
One concern we had was losing React’s component model. In practice, Astro’s .astro components are just as composable. You write HTML with frontmatter logic at the top, pass props, slot children — all the patterns you’re used to.
The difference is that Astro components have zero client-side runtime. They’re templates, not interactive widgets. And for a content site, that’s exactly what you want.
If you do need interactivity — a search bar, a form with validation, a dynamic widget — Astro supports “islands” of React, Vue, Svelte, or any framework. You get interactivity where you need it and static HTML everywhere else.
When You Still Need Next.js
Astro is not a replacement for Next.js in every scenario. You should stick with Next.js (or a similar full-stack framework) when:
- Your site has authentication. Login flows, session management, and protected routes are first-class in Next.js. Astro can do SSR, but it’s not where the framework shines.
- You need server-side API routes. If your frontend and backend are tightly coupled, Next.js API routes and server actions are hard to beat.
- Most of your pages are dynamic. Dashboards, admin panels, and data-heavy apps benefit from React’s client-side state management. Astro’s island architecture adds friction here.
- Your team already knows React deeply. If your engineers live in React and your site has complex interactive features, the migration cost to Astro may not be worth it.
The Decision Framework
Here’s the simple test we now use:
Is the primary content static (blog, marketing, docs, portfolio)? Use Astro. You’ll ship less code, load faster, and spend less time fighting framework complexity.
Is the primary experience interactive (dashboard, SaaS app, social platform)? Use Next.js or a similar full-stack framework. You need the client-side runtime.
Is it a mix? Consider Astro with islands for the interactive parts, or Next.js with aggressive static optimization. Both can work — pick whichever your team is more productive with.
Our Experience Rebuilding olabs.in
The migration took us about a week. Most of that time was spent simplifying — removing React state management, client-side routing, and hydration logic that we never needed in the first place.
The result is a site that consistently scores 95+ on Lighthouse Performance, ships under 70KB total, and builds in under 2 seconds. We deploy to Cloudflare Workers as static assets, and the site loads almost instantly on any connection.
The best part? The codebase is dramatically simpler. New team members can understand the entire site in an afternoon.
At OLabs, we pick the right tool for each project — not the trendiest one. Whether it’s Astro, Next.js, or something else entirely, we build what makes sense for your product. Talk to us.
Share this article
Written by a human, with assistance from AI.