Free SEO tools to analyze any website

Paste a website address and it tells you whether the site runs on WordPress, which theme it uses (with its version, its author and its parent theme if it’s a child theme), which page builder (Elementor, Divi, Bricks…) and which plugins load something on that page. Each finding comes with the clue in the code that gives it away.

Use it to see how a competitor’s site is built, to find the theme of a site you like or to check what a client has installed before you quote. Unlike other detectors, it reads the theme from the site itself instead of looking it up in a list, so it finds it even when it’s a premium theme. If the site isn’t WordPress, it tells you what it’s built with: Shopify, Wix, Webflow, Next.js…

Checks whether a site has an llms.txt, the file that sums up a website for AI assistants, and whether it’s well formed. It also reads the robots.txt and tells you, crawler by crawler, which of the 17 from ChatGPT, Claude, Gemini, Perplexity and other services can get in and which rule decides it.

Use it to find out whether your site shows up in AI answers or whether you’re blocking it by accident: a Disallow: / meant for something else shuts them all out. It separates the crawlers that train models from the ones that search to cite, which are two different things.

Shows how a page looks in Google results, on desktop and mobile, and how the link looks when shared on Facebook, X, LinkedIn and WhatsApp. It measures the title and the meta description in pixels, which is how Google truncates them, and warns you when they’re too long or too short.

Use it to write the title and description before you publish (you can enter everything by hand, nothing goes to a server) or to check a live page: why the title gets cut off, why the link shows no image on WhatsApp or whether the page has a noindex that keeps it out of Google.

The three tools run on the same engine as the Smart Design Inspector extension: the same rules to detect themes and plugins, the same reading of robots.txt and llms.txt and the same pixel measurements. What they say here is what the extension says.

When you paste an address, our server downloads only that site’s public files (its HTML, its robots.txt, the theme’s style.css…) and the analysis runs in your browser. We don’t use third-party services, we don’t ask for your email and we store neither the address nor the result.

What they can’t do is see the page the way your browser renders it: what loads with JavaScript, the fonts actually in use or the CSS of each element. That’s what the extension is for.