The Detailed SEO Extension comes from Glen Allsopp, who runs Detailed.com and is well known in the SEO industry for producing thoughtful, high-quality work. The extension reflects that care: it’s one of the best-designed SEO browser tools available, presenting on-page data in a clean, readable panel that doesn’t overwhelm you with numbers and columns.
You get all the essentials at a glance: title tag, meta description, canonical URL, robots meta tags, Open Graph data, structured data types present on the page, and a clear heading hierarchy. The schema detection is particularly handy, showing you at a glance whether a page has LocalBusiness, Article, Product, or other schema types implemented, without having to manually inspect the page source.
What I particularly like about Detailed is the heading visualiser. It shows you the full H1 to H6 hierarchy in a collapsible tree structure, making it easy to spot missing or misused headings in seconds. For auditing content at scale, that single feature saves a surprising amount of time. The extension is free, works on Chrome and Edge, and requires no account or sign-up. It’s one of the first things I install on any new browser, and if you work in SEO daily, I think you’ll feel the same way.