SEO Browser Extensions
Detailed SEO Extension: what it does, what it costs
The on-page inspector most working SEOs actually have installed. Free, no account.
Detailed SEO Extension at a glance
Every row is a verified field or an honest absence. A row is dropped rather than filled with an em dash, so the length of this table says how complete the record is.
| What it is | The on-page inspector most working SEOs actually have installed. Free, no account. |
|---|---|
| Category | SEO Browser Extensions |
| Best suited for | Anyone doing hands-on on-page or technical work daily |
| Starting price | Free |
| Free plan | Yes |
| Free trial | None offered |
| Main strength | Genuinely free with no account, no paid tier and no tracking |
| Main limitation | Development has slowed — the published changelog's latest entry is December 2024 |
| Evidence | Primary-source researched |
| Closest alternatives | MozBar, Screaming Frog SEO Spider, Keywords Everywhere |
| Pricing checked | 19 August 2026 |
| Record checked | 19 August 2026 |
What Detailed SEO Extension is
This is the extension you open thirty times a day. Click it on any page and you get the title, description, canonical, robots directives — including X-Robots HTTP headers, which most extensions miss because they only read the HTML — plus an indented heading outline with the font sizes preserved, so an over-optimised H2 stack is visible at a glance rather than inferred from source.
Its other half is the right-click menu, which opens the current page or site in Ahrefs, Moz, Majestic, Archive.org, SimilarWeb or Semrush, and runs site: and -inurl: searches. Saving a few seconds sounds trivial until you count how many times a day you do it. There is also schema viewing without a testing tool, hreflang with status codes, People Also Asked extraction, a user agent switch to view a site as Googlebot, and link and image exports to CSV.
It is free with no account and no upsell, which is unusual enough to be the point. Its author, Glen Allsopp, funds Detailed through a paid newsletter and audits rather than through the extension, and states plainly that it carries zero tracking. The visible cost is pace — the published changelog's most recent entry is December 2024.
What you can use it for
- Check a page's title, description, canonical and robots directives in one click
- Read the heading structure of any page, indented and sized
- View a page's schema markup without opening a testing tool
- Open the current page or domain in Ahrefs, Moz, Majestic or Semrush from the right-click menu
- Extract People Also Asked results, or export a page's links and images
The features that matter for SEO
Each one says what it does and the SEO job it serves. A vendor feature list without that second half tells you nothing you could not read on their own site.
One-click page overview
Shows title, description, canonical, indexability and other key elements, including X-Robots HTTP headers.
Reading the HTTP header rather than only the meta tag is the detail that matters — a page can be noindexed at the header level with nothing in the markup to show it.
Indented, sized heading outline
Lists all heading tags indented by level, with font sizes reflected.
Turns heading structure into something you can see. A broken hierarchy or a keyword-stuffed H2 run is obvious in the outline and invisible in a flat list.
Right-click menu to other tools
Opens the current page or site in Ahrefs, Moz, Majestic, Archive.org, SimilarWeb and Semrush, and runs site: and -inurl: searches.
The feature that makes it a daily habit. It removes the copy-paste step between the page you are looking at and the tool you check it in.
Schema viewer
Displays the structured data on the current page.
Faster than a validator for the common question of whether markup is present and what type it claims to be.
Hreflang with status codes
Lists localised versions of a page and whether each referenced URL returns and back-references correctly.
Hreflang fails silently and usually in one direction. Seeing status codes and back-references in the same view catches both failure modes.
People Also Asked extraction
Pulls PAA questions from search results in one click, including nested levels.
A free source of the question phrasing real searchers see, which is the raw material for FAQ and subheading work.
User agent switching
Lets you view a site as Googlebot or another agent.
The quickest way to catch cloaking or user-agent-dependent rendering without a crawler.
Link and image exports
Exports all page links, complete and incomplete, and all image URLs as CSV.
Enough for a single-page audit without starting a crawl, and the nofollow highlighting covers the related question.
Duplicate text search
Finds copies of highlighted text elsewhere on the web.
Answers both directions of the plagiarism question — whether someone copied you, and whether a writer copied someone else.
Pricing and limits
Starting price: Free Checked 19 August 2026 Vendor’s own pricing page
| Plan | Price | What it includes |
|---|---|---|
| Free | Free | Described by the vendor as free forever with no upsells. Detailed's paid products are a newsletter and SEO audits, sold separately from the extension.
|
Strengths and limitations
Strengths
- Genuinely free with no account, no paid tier and no tracking
- Checks X-Robots HTTP headers, which most page inspectors ignore
- The right-click menu into other SEO tools saves time every day
- Covers schema, hreflang, PAA extraction and user agent switching in one extension
- Chrome and Firefox, and widely used — the vendor cites 450,000 weekly users
Limitations
- Development has slowed — the published changelog's latest entry is December 2024
- Single-page only, so no crawling, no site-wide view and no history
- No keyword volumes, link metrics or difficulty scores of its own
- Some features sit behind an advanced tab and are off by default
- Chrome and Firefox only, with no Edge or Safari build
Who it is for, and who should skip it
Worth it if
- Anyone doing hands-on on-page or technical work daily
- Checking indexability, headings and schema quickly on live pages
- Jumping from a page into whichever paid tool you already subscribe to
Skip it if
- You need site-wide analysis — this is a page-at-a-time inspector
- You want keyword or link metrics in the extension itself
- You need active, frequent development
Alternatives to Detailed SEO Extension
Each one answers when it is the better choice, which is the only thing a list of competitors is useful for.
- MozBar Choose it when you want domain and page authority scores overlaid on search results.
- Screaming Frog SEO Spider Choose it when the question is site-wide rather than about the page in front of you.
- Keywords Everywhere Choose it when you want search volumes in the browser rather than on-page diagnostics.
Sources and verification
Last verified 19 August 2026 1 day ago
Pricing 19 August 2026 Plans 19 August 2026 Features 19 August 2026
- Detailed SEO Extension Official site verifies features, pricing, plans checked 19 August 2026
- Detailed pricing Pricing page verifies pricing checked 19 August 2026
What changed
- 19 August 2026 — Listed as a free tool with no pricing figure. Detailed sells a newsletter and audits at detailed.com, but the extension itself has no paid tier, so no price from that page is attached here.
Questions
Is the Detailed SEO Extension really free?
Yes — no account, no paid tier, and the vendor states there is no tracking. Detailed makes its money from a paid newsletter and SEO audits sold separately. The extension is described as free forever.
What does it do that other on-page extensions do not?
Two things stand out. It checks X-Robots HTTP headers rather than only meta tags, so it catches header-level noindex that markup-only extensions miss. And its right-click menu opens the current page or domain directly in Ahrefs, Moz, Majestic, Archive.org, SimilarWeb or Semrush.
Is it still being updated?
The published changelog's most recent entry is December 2024, so development has clearly slowed. The feature set is mature and still works, but treat it as a stable tool rather than an actively evolving one.