"Which CMS should I use" is really three different questions depending on what you're building: a content site, an online store, or something that needs to scale across a large organization. WordPress, Shopify, and Drupal each answer a different one of those well — and answer the other two poorly.
WordPress: the default for content-first sites
WordPress powers a large share of the web for a simple reason: it's fast to start, has the largest theme and plugin ecosystem of any platform, and doesn't require developer involvement for day-to-day publishing. It's the right choice for blogs, marketing sites, portfolios, and small business sites where content — not transactions — is the primary job of the site.
Its weak point is the same thing that makes it flexible: a huge, uneven plugin ecosystem means quality and security vary enormously between installs. A well-maintained WordPress site is excellent; a neglected one accumulates plugin bloat fast.
Shopify: built for one job, done well
Shopify trades WordPress's flexibility for focus. It's a hosted platform purpose-built for e-commerce — checkout, inventory, payments, and shipping are handled natively rather than bolted on through plugins. That focus is exactly why it's the default choice for stores that need to be reliable and fast to launch without a dedicated engineering team.
The tradeoff is customization ceiling: Shopify stores that need deeply custom logic outside its app ecosystem eventually hit walls that a self-hosted platform wouldn't have.
Drupal: built for scale and structure
Drupal shows up most often behind government agencies, universities, and large media organizations — sites with complex content models, strict access-control requirements, or a need to manage thousands of pages with structured, reusable content types. It rewards a real development team and punishes trying to run it without one.
It's rarely the right choice for a small site. It's frequently the right choice for a large, structurally complex one.
How to tell which one a site is already running
Each platform leaves a visible fingerprint if you know where to look — WordPress references wp-content/ throughout its markup, Shopify embeds an inline Shopify.theme object, and Drupal sites typically expose an .info.yml-backed theme path under /themes/custom/. Rather than checking manually, our Auto-Detect tool identifies the platform automatically and runs the matching scan in one step.
The short version
Building a content site or blog: WordPress. Building a store: Shopify. Building something large, structured, and access-controlled: Drupal. Most projects only need to seriously weigh two of the three.