WordPress, Wix, Shopify, Webflow or Next.js: Which Platform Best Prepares Your Site for AI?

Switching platforms won't make your site citable by ChatGPT. That's the sharpest finding from our September 2026 study, covering 2,994 websites and 7,696 pages audited between June 8 and September 16, 2026.

WordPress, Wix, Shopify, Webflow or Next.js: your platform does decide part of your visibility in AI engines. 9.4 points separate the best-scoring one from the worst — and part of that gap comes from Wix being the one platform we could only measure on its home page. Between platforms measured on comparable pages, it drops to 5.9 points.

But on the measure that carries the most weight in our AI visibility score, the mark out of 100 that rates how readily a page can be lifted into an AI answer, every platform fails somewhere between 95% and 99%. Here's what a platform does for you, and what it will never do in your place.

What does the study show, at a glance?

According to our September 2026 study of 2,994 sites, your platform shapes a site's technical layer and almost nothing about its content. Four numbers below carry the finding. Each drops from its denominator the pages where the check doesn't apply, and all of them come from audits run between June and September 2026.

• 9.4 points separate the best platform from the worst. Next.js and JavaScript framework sites score 50.0 out of 100 on AI visibility, WordPress 47.7, Webflow 46.9, Shopify 44.1, Wix 40.6 on its home page alone. Sample average: 46.0.
• On content, the gap vanishes. Fewer than half the sections open with a citable passage on 95.3% to 98.7% of pages in 2026, whatever the platform.
• The settings a platform hands you, or doesn't. 77.1% of sites have no llms.txt file, the plain text file at the root of a domain that describes your key pages to language models: 0% on Wix, 8.7% on Shopify, both of which generate it automatically. And 68.8% declare no brand entity, the structured-data ID card that ties a citation back to a company.
• Neither size nor industry closes the gap. Per company data from INSEE, the French statistics office, average AI visibility runs from 48.0 to 52.8 by headcount and from 46.2 to 52.7 by industry: less spread than between platforms.

How did we measure it, and what can't the sample tell you?

We ran the 46 checks of a LightSpot audit against every site, 21 on classic SEO and 25 on visibility in AI engines, between June and September 2026. The sample covers 2,994 domains, overwhelmingly small and mid-sized French businesses. It is not representative of the global web, and here is everything it cannot settle.

We kept one audit per domain, the most recent completed between June 8 and September 16, 2026, and dropped failed audits along with audits a customer ran on a competitor. All 46 checks are public, in our criteria reference. These sites weren't drawn at random: 16 customer sites, 2,781 companies reached through targeted outreach and 197 anonymous audits launched from our own site, with 43% of domains on .fr and 46% on .com.

72% of sites have three pages audited, the home page plus two pages taken from the sitemap, or from the page's own links when the sitemap doesn't supply enough. 25% have only one. Content checks are judged page by page, while site-wide checks are read on the home page.

The platform is identified on that same home page, from signatures left in the HTML: /wp-content/ for WordPress, cdn.shopify.com for Shopify, parastorage.com for Wix, data-wf-site for Webflow, /_next/static/ for Next.js. With no signature, a site is filed as "unidentified": 971 sites, 32% of the sample, a catch-all holding Drupal, Joomla, Framer, HubSpot and bare HTML pages, never a platform in its own right. The "Next.js and JavaScript frameworks" group covers 166 sites, 138 on Next.js, 19 on Astro, 9 on Gatsby: not every custom-built site, only those whose build tool leaves a trace.

Two caveats. Our 99 Wix sites have a single audited page, the home page: our crawler doesn't follow the absolute links Wix writes to the www. domain. Every Wix figure here is therefore a home-page figure, and we flag it each time. Squarespace, at 25 sites, is too thin to appear in a ranking.

Above all, these gaps are correlations, not causes: a platform attracts a type of publisher, and every gap measures the platform as much as the profile of the people who choose it. Our sample doesn't look like the market either. Per W3Techs (August 2026 reading), WordPress holds 59.1% of the CMS market, Shopify 7.6%, Wix 6.1%, Squarespace 3.5% and Webflow 1.2%: we over-represent WordPress and Webflow, and under-represent Wix and Shopify.

What we left out, and why

Six measures were pulled out of every platform comparison: reading the code of our own checkers, we found they measured the platform rather than the site. The canonical tag and internal links first, because our crawler compares against the requested URL and not the final one after redirection, so any site that forces the www prefix fails automatically. Crawlable links next, where the test reads raw HTML, scripts included. Then the page-by-page FAQ schema, whose trigger is fooled by JavaScript, and content length, which demands 1,500 words even of a home page.

Mobile performance closes the list, at 94% failure everywhere: we publish it only as an overall finding. These fixes are under way in our engine, and the 46-check reference stays public, condition by condition.

The platform ranking, and what it's actually worth

According to our September 2026 study, Next.js and JavaScript framework sites earn the best AI visibility score, 50.0 out of 100, ahead of WordPress at 47.7 and Webflow at 46.9. The ranking holds, but the spread is narrow and the distributions overlap heavily: no platform guarantees a good score to the people who pick it.

Three things to read here. The order first: Next.js and JavaScript frameworks is the only group where a serious share of sites clears 60 on AI visibility, 24.7% against 9.5% overall, with 16.3% scoring A or B against 3.0%.

Then the spread, which is narrow. The standard deviation of the AI score runs from 9.6 on WordPress to 12.6 on Next.js in 2026: there are excellent WordPress sites and poor Next.js ones.

Robustness last. Keeping only three-page audits, the order doesn't move: Next.js 50.6, WordPress 47.9, Webflow 47.2, Shopify 44.7, unidentified 43.7. That's also how we size the Wix caveat: going from one page to three is worth 1 to 5 points, not ten.

One number deserves to be pulled out: Shopify shows the widest gap between its two scores, 23.9 points, 68.0 on SEO against 44.1 on AI visibility. Across the sample, only 4% to 11% of sites score higher on AI than on SEO. The picture hasn't shifted since our August 2026 study of 2,563 sites: September's averages, 63.7 and 46.0, are within a point of August's, 63.5 and 45.1.

What your platform decides for you: the technical layer

Your platform decides the settings a reader never sees: the llms.txt file, structured data, the access left open to AI crawlers. They come out of the theme, the CMS or the plugin, identically across thousands of sites, and that's where the gaps measured in 2026 are widest, up to 82.8 points between two platforms.

Here are the eight most telling, as the share of sites failing on their home page.

Wix and Shopify hand you the llms.txt file. Per Wix's own documentation, the platform generates the file for the sites it hosts, with nothing asked of the owner, and Shopify serves one by default on stores. In our September 2026 study, 0% of Wix sites and 8.7% of Shopify stores lack it, against 82.8% on WordPress: a factory setting, not merchant effort. Worth noting, no major engine officially recognizes the file today and Google has said outright it doesn't use it, so treat it as a zero-cost move rather than a lever.

The structured-data graph mostly measures whether Yoast is installed. Only 18.2% of WordPress sites lack one in 2026, against 80% to 99% everywhere else. That number doesn't say WordPress structures data better: Yoast and Rank Math emit the graph by default, the block that ties a site's entities together, the organization, the page, the author. The check measures "this site runs Yoast," not the quality of the graph.

A brand entity, on the other hand, is almost never handed to you. 68.8% of sites declare none in 2026: no structured data, the tags invisible to a reader that describe a page to machines, giving the company name and its official profiles. Shopify does best at 50% missing, because popular themes emit it with the store's social links. Wix sits at 99% missing, producing none without hand-added code.

Client-side rendering stays marginal. People often say a JavaScript-built site is invisible to AI. Our 2026 numbers say otherwise: 2.7% of home pages serve under 100 words in their initial HTML, 3.6% on Next.js and frameworks, 11.1% on Wix. It hits fewer than three home pages in a hundred.

Two figures round out the table. 4.5% of sites block at least one AI crawler such as GPTBot, ClaudeBot or PerplexityBot, the programs that comb the web to feed ChatGPT, Claude or Perplexity. And 93.2% fail on image alt text, from 91% to 98% depending on the platform.

What no platform does for you: the content

No platform writes your pages. On the citable passage opening a section, the measure that carries the most weight in our AI visibility score, failure runs from 95.3% to 98.7% depending on the platform, according to our September 2026 study. Put another way, changing CMS does not make a text citable.

Basis: 2,262 sites and 5,635 pages, from audits recent enough to know an editorial check doesn't apply to a product page. A dash means fewer than 30 pages measured, in which case we publish nothing. These rates also don't cover the same kinds of pages from one platform to the next, because each platform produces a different mix. Here's what we audited:

Read the table below with that in mind: Wix is judged almost entirely on home pages, Shopify heavily on product pages, WordPress on the widest mix. The gaps that follow therefore also measure what kind of page each platform serves.

The first row sums it up. On the citable passage, failure runs from 95.3% to 98.7%: three points between best and worst, when failure is universal. On answer blocks it runs from 79% to 97%, on cited sources from 82% to 100%. The text simply isn't written to be quoted.

This isn't only our reading. Princeton research presented at the ACM KDD 2024 conference, "GEO: Generative Engine Optimization", measured that adding sourced statistics lifts a page's visibility in AI engines by up to 40%, and that citing credible sources can raise it by 115%.

The Next.js exception isn't one. These sites do better almost everywhere in 2026: 48.8% of editorial pages carry unsourced figures against 94.3% overall, 14.3% have no named author against 93.3%, 63.5% haven't been updated recently against 86.4%. The framework isn't the explanation: these are sites run by technical teams with a well-tooled blog, writing for readers who came looking for answers. It's a "who publishes" effect, not a "which tool" effect, and a brochure site rebuilt on Next.js inherits none of those numbers.

The Shopify case: the answer never comes first. 68.3% of the Shopify pages we measured, across the 50 stores in the sample, don't open with an answer in their first 200 words, against 13.4% to 26.5% elsewhere. A product page almost always opens with a name and a price, rarely with the sentence that answers the buyer's question, along the lines of "does this bag fit a 15-inch laptop?". The fix is one sentence moved to the top of the page.

Wix, on its home page alone, really only breaks down on two measures: 70.8% leave the topic's sub-questions uncovered and 97.2% of sections open with no answer block. With no inner pages audited, those figures hold for the home page only.

The home page is the least citable page on a site. Across every platform, editorial pages do better: 85% failure against 92% on answer blocks, 14% against 22% on opening with an answer, 87% against 98% on cited sources. That's awkward, because the home page is most often an engine's way into a site.

"A platform can hand you a technically flawless site that is still invisible in an AI answer. What's missing isn't a setting, it's an answer sentence at the top of each section, and nobody will write it for you," says Nicolas Meridjen, founder of LightSpot and author of this study.

WordPress: Yoast, All in One SEO, or nothing?

Neither one moves the score. According to our September 2026 study, WordPress sites running Yoast reach 47.9 out of 100 on AI visibility, against 47.6 with no plugin detected and 46.6 on All in One SEO. What each plugin really changes comes down to two or three specific settings.

On SEO, sites with no plugin detected actually do slightly better, 65.5 against 62.6. One clarification matters: "no plugin detected" doesn't mean "no plugin", since SEOPress and others leave no signature we know how to read. Rank Math shows up on just 2 sites in the sample: too few to draw a measurement from, even though the plugin comes up again below for what it can do.

What Yoast actually delivers comes down to two things: the structured-data graph, missing on 5.7% of its sites against 35.4% without a plugin, and the last-updated date. What it doesn't deliver is the text: 43.9% of Yoast sites have a title tag that's missing or off-template, against 36.2% with no plugin detected. A plugin gives you the field; it doesn't write in it.

All in One SEO wins on one point, and that point is llms.txt: 34.6% of its sites lack the file, against 87.8% of Yoast sites. Per the official documentation of both plugins, All in One SEO generates it and switches it on by default as of version 5.0.1, while Yoast has offered it since version 25.3, released in June 2025, as an option to enable under Settings, Site features, APIs. One checkbox, and nobody will tick it for you. These figures rest on 63 sites: a direction, not a precise measurement.

Company size and industry barely move the needle

Per company data from INSEE, the French statistics office, matched to 888 sites in our sample, average AI visibility ranges from 48.0 to 52.8 by headcount and from 46.2 to 52.7 by industry in 2026. A two-person company starts from the same place as a three-hundred-person one.

By headcount there is no readable progression: the 50-to-99-employee band is the lowest of all, the 250-to-499 band the highest, on just 9 sites.

By industry the spread is slightly wider. Fifteen industries have at least twenty sites; here are the ten most recognizable ones, best to worst on AI visibility. The other five all sit between 49.4 and 50.4, squarely mid-table.

Industries follow the French national classification, which is why some labels look unfamiliar. One reading note: this sub-sample of 888 sites averages higher on AI visibility, around 50, than the full sample at 46.0. So compare industries with each other, never with the overall average.

From publishing at 52.7 to architecture and engineering at 46.2, the spread across industries is 6.5 points, the same order of magnitude as the 5.9 points separating platforms measured on comparable pages. The two numbers come from different samples and don't add up; what they say together is that neither your trade nor your CMS decides much. Two industries do stand out, publishing and software consulting, with 13.0% and 20.0% of sites above 60: two trades where people publish text to explain things.

What should you do, depending on your platform?

Three moves per platform, drawn from the numbers in our September 2026 study and ordered by payoff, then three moves that apply to everyone. None of them calls for a rebuild: these are settings to switch on and paragraphs to rewrite, on the pages that matter to you.

WordPress

1. Turn on llms.txt. 82.8% of WordPress sites don't have it. Under Yoast it's a checkbox in Settings, Site features, APIs; under All in One SEO it's already done.
2. Declare your brand entity. 62.7% have none, even though Yoast and Rank Math both offer the screen for the organization's name, logo and social profiles.
3. Rewrite your title tags. 39.5% are missing or off-template, and no plugin will write them for you.

Shopify

1. Add an answer sentence at the top of each product page. Among the content checks, that is the widest gap in the study between one platform and the rest: 68.3% failure on Shopify against 13.4% on Next.js.
2. Fill in your meta descriptions. 58% of stores have them missing or off-template, against 44.5% on average.
3. Check your brand entity. One store in two declares none: your theme either emits it or doesn't, so look rather than assume.

Wix

1. Flesh out your home page. This is where Wix falls furthest behind, on sub-question coverage as much as on answer blocks.
2. Add a brand entity. 99% of Wix sites have none: on this one check, no other platform is anywhere near as bare.
3. Fix your heading structure. 56.6% of Wix home pages have a missing or duplicated main heading, and 68.7% an off-template meta description.

Webflow

1. Add a structured-data graph. 89.9% of Webflow sites have none, even though the tool lets you drop the block into page settings.
2. Declare your brand entity. 68.1% missing, right on the overall average, so there's no technical excuse.
3. Fill in your image alt text. 97.8% of Webflow sites fail, the worst figure among identified platforms.

Next.js and JavaScript frameworks

1. Add llms.txt. This is the strongest group in the study, and still 60.4% don't have it.
2. Add a structured-data graph. 80.1% have none, when you control the HTML end to end.
3. Check what a crawler sees without JavaScript. 3.6% of home pages serve under 100 words in their initial HTML.

And three moves that apply to everyone, because no platform makes them:

1. Open every section with a 40-to-60-word answer. 95.5% of pages fail on this one point, and 90.9% have no answer block under their subheadings at all. It's the cheapest fix on the list.
2. Date and attribute your figures. 94.3% of editorial pages quote statistics with no identifiable source, and 92.6% of statistics carry no date at all.
3. Add a table of facts to every important page. 96.9% of pages have none, even though it's the format that comes up most often in published work on the subject. Our review of the GEO techniques that actually work covers what has been measured elsewhere.

What should you take away?

Your platform decides the technical layer, and nothing else. It can hand you an llms.txt file, a structured-data graph, sometimes a brand entity: those are precisely the points where platforms differ most from one another, by up to 82.8 points on a single check.

It will never write an answer paragraph under a subheading, date your figures or cite your sources. On the citable passage, 95% to 99% of pages fail in 2026 whatever the tool. The good news is that the list of moves to make is short, and it's the same one whatever platform you're on.

Where does your own site stand?

An average sketches a landscape, not your site: only an audit of your own URLs settles it. LightSpot's free audit runs the same 46 checks used in this September 2026 study against your URL, on 3 pages, with no account to create, once a month.

You get both scores, SEO and AI visibility, plus the audit's top 3 fixes, each with the exact fix spelled out.

To cite this study: LightSpot, "WordPress, Wix, Shopify, Webflow or Next.js: Which Platform Best Prepares Your Site for AI?", September 2026, https://lightspot.ai/en/blog/platform-ai-readiness-study-2026. A link to this page helps your readers check the numbers, and helps us keep publishing them.