Astro is good for SEO, and for most marketing sites it is better than WordPress. Both platforms cover the SEO basics, so the gap is architecture, not features. WordPress assembles pages from a theme, a builder and plugins, which makes slow the default. Astro ships almost no JavaScript and renders to static HTML, which makes fast the default. That speed advantage shows up in Core Web Vitals and, increasingly, in how readable your site is to AI answer engines. WordPress still wins for content-heavy teams and WooCommerce. Astro wins for fast marketing sites that need to be cited.
Quick links
- Is Astro good for SEO?
- How Astro and WordPress actually differ for SEO
- What the Core Web Vitals data says
- When WordPress is still the right call
- When Astro wins
- What you give up moving to Astro
- FAQ
Is Astro good for SEO?
Yes. Astro is good for SEO, and the reason is structural rather than clever.
Astro renders your pages to clean HTML on the server, then sends that to the browser. There is no client-side framework deciding what to draw after the page arrives. Google gets a finished page to crawl, with full control over titles, meta descriptions, canonical tags, structured data and sitemaps. None of that is unique to Astro, but it removes the usual technical excuses in the same way a good SEO plugin does on WordPress.
The part that is unusual is the weight. Astro ships zero JavaScript by default and uses an islands architecture, where the page is static HTML and only the genuinely interactive pieces load their own small scripts. Most marketing pages need almost no interactivity, so most Astro pages ship almost no JavaScript. JavaScript is one of the slowest things a browser has to deal with, so cutting it out makes pages light and fast without a queue of optimisation plugins doing the work after the fact.
Light and fast is the whole SEO story here. Faster pages pass Core Web Vitals, which Google confirms its ranking systems use, and they are easier for AI answer engines to parse and cite. If you have read our piece on whether WordPress is good for SEO, this is the other side of the same coin: WordPress does not stop you ranking, but Astro removes the speed ceiling that WordPress quietly imposes.
How Astro and WordPress actually differ for SEO
The honest comparison starts with one fact: both platforms can rank. WordPress runs 41.5% of all websites and 59.3% of every site with a known content management system, and plenty of those sit at the top of Google. So this is not a story about one platform being broken. It is a story about defaults.
The difference is how a page gets built.
WordPress assembles a page when it is requested. PHP runs, the theme loads, the page builder renders its layout, and each active plugin adds its own code and database queries. The result works, but it carries weight the visitor never sees. A typical WordPress marketing page leans on a builder like Elementor, a handful of plugins and a stack of scripts, and all of it has to download and run before the page settles.
Astro inverts that. It does the assembly at build time and serves static HTML. There is no theme engine running per request, no builder shipping its layout code to the browser, and no plugin scripts unless you deliberately add one. The page that lands in the browser is mostly just content and styling.
For SEO, three things follow from that:
- Architecture. Pre-rendered HTML gives crawlers and AI engines a clean, finished page. There is less to wait for and less to misread.
- JavaScript weight. Astro’s default is close to zero client-side JavaScript. WordPress’s default, once a builder and plugins are involved, is a lot of it.
- Speed. Less weight means faster loads, better Core Web Vitals and lower bounce. Speed is a modest direct ranking factor, but a large conversion and AI-readability one.
You can make a WordPress site fast. It takes caching, careful hosting, plugin discipline and a light theme. Astro starts where a heavily-optimised WordPress site is trying to get to.
What the Core Web Vitals data says
The numbers back up the architecture argument, and they come from real sites rather than lab tests.
HTTP Archive’s Core Web Vitals report, covered in detail by Search Engine Journal, ranked seven content management platforms on the share of sites passing Core Web Vitals. WordPress finished last, with about 49% of WordPress sites passing. Astro passed at roughly 67%. The page-weight gap pointed the same way: WordPress carried a median page weight around 2.6 MB, against roughly 1.6 MB for Astro. A megabyte of difference, on the median page, is the JavaScript-and-builder tax made visible.
A fair caveat: the report also showed that page weight does not perfectly predict Core Web Vitals, and a couple of heavier platforms still scored well. Architecture is a strong tendency, not an iron law. A disciplined WordPress build can pass, and a careless Astro build can fail. But the platform sets the default outcome, and on the evidence Astro’s default is fast while WordPress’s is not.
Does it matter for SEO? Some, directly. More importantly, a slow page loses visitors before they convert and gives AI answer engines a heavier, messier document to read when they decide who to cite. Speed stopped being purely a Google ranking question some time ago.
When WordPress is still the right call
Astro is not the answer to every site, and pretending otherwise would be dishonest.
Keep WordPress when a non-technical team needs to publish and edit content every day without calling a developer. WordPress’s editing experience is mature, familiar and genuinely good for high-volume publishing. Keep it when you depend on a plugin ecosystem, WooCommerce being the obvious one: it runs a large share of online stores, and rebuilding that machinery from scratch on a static stack rarely makes sense. And keep it when your current WordPress site is already fast, well hosted and lightly plugged. A healthy WordPress site is not a problem to solve. We say as much on our own WordPress redesign and build page: the answer is not always to leave.
WordPress was a reasonable default for years, and for content-heavy and commerce sites it often still is. The mistake is treating it as the automatic choice for a marketing site whose main job is to load fast and get found.
When Astro wins
Astro wins for the fast marketing site. That is the sweet spot, and it is a large one.
If your site exists to explain what you do, build trust and turn visitors into enquiries, it needs to be quick, structured and easy to read. It does not need a content team publishing twenty posts a week or a shopping cart with stock control. That profile is exactly where Astro’s architecture pays off: pages ship almost no JavaScript, pass Core Web Vitals more often, and present clean HTML that AI engines can lift and cite. As those engines read sites more than humans do, being light and well-structured is turning into a real visibility advantage rather than a nice-to-have.
We build on Astro for this reason, and the difference shows on real projects. When we rebuilt a UK PPC agency’s slow Elementor WordPress site on Astro, mobile PageSpeed went from 34 to 86 and desktop from 55 to 99, and the site was live in four weeks. Same content, same business, an architecture that does not fight the speed targets. If you are weighing a rebuild, our Astro web design and build page walks through how we approach it.
What you give up moving to Astro
Astro is not free of trade-offs, and you should know them before you switch.
You give up the plugin-and-click convenience. There is no marketplace of one-click add-ons you can install from a dashboard to bolt on a feature. You give up some self-service: changing the structure of a page, adding a new section type or wiring up a new integration is a developer job, not a drag-and-drop one. If your model depends on a marketer rearranging the site weekly without help, that friction is real.
What you get in return is a site that is fast by default, clean under the bonnet and easy for both Google and AI engines to read. For a marketing site, that is usually the better deal. For a daily-publishing content operation or a busy store, it may not be. The honest position is that Astro suits a specific job extremely well, and you should pick it for that job, not because it is new.
If you are not sure which side of the line your site sits on, get the numbers before you commit either way.
See whether your site is fast enough to compete
Before you choose between Astro and WordPress, get the numbers on the site you have. Our free website audit grades your site on speed, SEO and AEO, then shows you the specific fixes, so you can decide whether a rebuild is worth it before you commit.
- Your real speed, SEO and AEO scores, in plain English
- The handful of fixes that would move the needle most
- An honest verdict: if your site is already fast and healthy, keep it