TL;DR Summary:
Three Platforms Dominate: WordPress, Shopify, and Wix now control 73% of the CMS market, dictating SEO defaults for millions of sites.WordPress Shrinks Fast: It lost 2.9% share while Wix surged 22.4% and managed platforms fund massive SEO engineering teams.Platform Choice Wins: Defaults like Yoast settings and llms.txt outperform individual tweaks, shifting high-value work to migrations.Three CMS Platforms Now Control 73% of the Market and Your SEO Defaults
The website building world changed while most people weren’t looking. Three content management systems now control 73% of the entire CMS market share. WordPress, Shopify, and Wix don’t just power websites anymore. They decide how millions of sites handle SEO.
This shift means something big for business owners and marketers. The platform you choose now matters more than individual SEO work. When Wix updates its SEO features, millions of websites change instantly. No single SEO consultant can match that scale.
WordPress Loses Ground While Managed Platforms Surge
WordPress still leads with 43% of all websites, but its growth stopped. Between December 2024 and December 2025, WordPress actually shrank by 2.9%. Meanwhile, Wix grew 22.4% and Squarespace grew 6.2%.
The numbers tell a clear story. Shopify posted $11.56 billion in revenue. Wix hit $1.99 billion. These companies fund engineering teams that set SEO defaults for millions of sites at once.
Shopify grew 929% over the past decade. It now powers 7.2% of all websites using a content management system. That’s massive growth for an e-commerce platform that barely existed ten years ago.
The old players paid the price. Joomla fell 79%. Drupal dropped 80%. Both got overtaken by platforms that prioritize ease of use over technical flexibility.
Platform Defaults Shape SEO More Than Individual Work
Here’s the surprising part. Most SEO improvements now happen at the platform level, not site by site. The Web Almanac analyzed 17 million websites and found something striking.
Yoast SEO runs on nearly 16% of all desktop websites. It accounts for 70% of all identified SEO tool usage. When Yoast sets “index, follow” as its default, 64% of web pages end up with follow directives. Most site owners never chose this setting.
The same pattern shows up everywhere. Canonical tags appear on 68% of desktop pages. Meta robots usage hit 47%. These gains track with CMS adoption rates, not with individual optimization efforts.
Even newer standards follow this pattern. About 2% of sites now have llms.txt files for AI crawlers. But 40% of those files came from All in One SEO as a default feature. Most site owners don’t know what llms.txt does.
WordPress Governance Crisis Adds Risk
WordPress faced more than market pressure. A major dispute with WP Engine in September 2024 exposed governance problems. Matt Mullenweg, WordPress’s leader, blocked WP Engine customers from updating plugins and themes.
The fallout was severe. Automattic, WordPress’s parent company, cut its development hours from 3,988 per week to just 45. BlackRock marked down its Automattic shares by 63.5%. WordPress shipped only two major releases instead of the usual three.
This dispute showed the risk when 43% of the web depends on one platform’s decisions. Business owners started looking for alternatives.
Performance vs Market Share Creates Paradox
WordPress has the worst Core Web Vitals scores at 45% pass rate on mobile. Wix achieves 75% and Duda hits 85%. Wix also scores perfect 100 on Lighthouse SEO tests.
But WordPress still dominates among high-traffic websites. It powers 49% of top-ranking domains that use a content management system. Wix and Shopify barely appear in the top 10,000 sites by traffic.
The reason is simple. Top WordPress sites invest in premium hosting and careful optimization. Average WordPress sites run on cheap shared hosting with poorly configured plugins.
Managed platforms like Wix control the entire technology stack. They produce more consistent results because they don’t allow the variability that creates WordPress’s problems.
What This Means for Your Business Strategy
The highest-value SEO work is moving to platform selection and migration. Knowing what each platform does automatically versus what requires manual setup is crucial knowledge.
WebStarts represents this shift toward managed SEO defaults. It offers built-in technical optimization without requiring you to understand different SEO plugins or manage compatibility issues.
For small businesses, the math is simple. Platforms with good defaults beat custom WordPress installations that nobody maintains. The CMS market share data proves this trend will continue.
Migration consulting is now high-value work because switching costs are real. Shopify’s 100,000 redirect limit alone creates demand for expertise.
CMS Market Share Will Keep Consolidating
Individual SEO professionals still matter at the site level. But engineering teams at three companies now control technical SEO defaults for most of the web.
The consulting industry hasn’t fully adapted to this reality. The highest impact comes from influencing platform defaults, not optimizing individual sites.
Ready to escape the WordPress maintenance trap and consolidate your website tools into one platform? What would it mean for your business to have hosting, SEO, e-commerce, and email marketing work together seamlessly in WebStarts?
