Detailed SEO Extension vs SEOMarkup Schema Inspector (2026): which should you pick?
As of Oct 23, 2026, Detailed SEO Extension grades higher than SEOMarkup Schema Inspector: 3.0 against 2.8 out of 4.0.
Checked Oct 23, 2026 · graded Oct 23, 2026 by ToolGPA
Detailed SEO Extension grades higher on features. They get the same grade on value for money, the free plan, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Detailed SEO Extension
Free Chrome and Firefox extension for one-click on-page SEO checks
Free
SEOMarkup Schema Inspector
Free, open-source Chrome extension that shows a page's JSON-LD
Free
Which one is for you
Pick Detailed SEO Extension if
- Fits if you check titles, headings and schema on single pages and don't want to read the source
- Works for checking hreflang on a multi-language site, alternate by alternate
Look elsewhere if
- Skip it if you want search volumes, rankings or backlinks, as it has none of its own
- Too light for whole-site audits, since it inspects one page at a time
- Not for you if you browse in Safari or Edge, as only Chrome and Firefox are listed
- Watch out: the changelog's last entry is December 2024, though both stores show an update in 2026, and the interface is English only
Pick SEOMarkup Schema Inspector if
- Fits if you debug structured data before a release and want to read it as a tree
- Works for seeing which schema types a competitor's page uses
Look elsewhere if
- Skip it if the page uses Microdata or RDFa, which are only flagged, not shown
- Too light for validation on its own, as that means opening Google's or Schema.org's tester
- Not for you if you use Firefox or Safari, as it runs in Chromium browsers only
- Watch out: the developer hasn't identified itself as a trader, so EU consumer rights don't apply
How we grade them
| 3.0GPADetailed SEO ExtensionVery good | 2.8GPASEOMarkup Schema InspectorGood | |
|---|---|---|
| Value for money | AFree outright on Chrome and Firefox, and its page says there's no paid version and no upsells. Tags, headings, links, schema and hreflang all come at no cost. | AFree for good and open source under the MIT license, with no paid tier, trial or card. |
| Free plan and trial | AEvery feature is free, with no account, no plan to upgrade to and nothing held back. | AFree outright: every feature in the extension, with no account needed. |
| Features | CTitle, meta description, meta robots and X-Robots-Tag, headings, link and image exports, schema, hreflang with return-link checks and People Also Ask extraction. The gap the listing names: no keyword volumes, rankings or backlink data of its own. | DOne narrow function: JSON-LD parsed into trees, @graph split up, full-text search, copy and download, and parse error banners. Microdata and RDFa are only detected, and validation means opening Google's or Schema.org's tester. |
| Ease of use | BNo rating on record, but there's nothing to set up: install it, open a page, click the icon and the panel is there. | BNo rating on record, but no account and nothing to set up: open a page, click the icon and the schemas are listed. |
| Platforms and integrations | CChrome and Firefox extensions, so computers only, with no Safari or Edge version named. The Ahrefs, Semrush, Moz and Majestic links open those sites; no data is pulled in from them. | CChrome and other Chromium browsers, so computers only, with no Firefox or Safari version. It hands off to Google's Rich Results Test and the Schema.org validator. |
| Best for | one-click page checks in Chrome or Firefox | reading a page's JSON-LD as a tree |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Detailed SEO Extension and SEOMarkup Schema Inspector. How we grade
Price against what you get
Detailed SEO Extension has no paid plan and scores 2.3 out of 4 on features, ease of use and platforms. SEOMarkup Schema Inspector has no paid plan and scores 2.0.
Detailed SEO Extension scores higher for the same starting price. Of the other SEO browser extensions on the chart, none scores higher than Detailed SEO Extension for less, and none scores higher than SEOMarkup Schema Inspector for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- SEOMarkup Schema Inspector is open source, according to its own site.
- Detailed SEO Extension also covers site audit.
In commonFree planBrowser extensionSchema markup
At a glance
| Detailed SEO Extension | SEOMarkup Schema Inspector | |
|---|---|---|
| Pricing | Free | Free |
| Starts at | Free | Free |
| Free plan | The whole extension is free on Chrome and Firefox; its page says there are no upsells and no paid version. | Completely free, with no paid tier, trial or card; the vendor's FAQ says it is free for good and open source under the MIT license. |
| Free trial | None listed | None listed |
| Browser extension | ||
| Made by | Detailed | SEOMarkup |
| Price read from | detailed.com | seomarkup.site |
| Checked | Oct 23, 2026 | Oct 23, 2026 |
Worth knowing
Detailed SEO Extension
- It inspects one page at a time and has no keyword volumes, rankings or backlink data of its own.
- It is listed for Chrome and Firefox only; the vendor names no Safari or Edge version.
- The changelog's latest entry is December 2024, though both stores show version 2.2.7 updated in 2026.
- The interface is in English only, according to the Chrome Web Store listing.
SEOMarkup Schema Inspector
- Microdata and RDFa are only detected and labelled, not displayed; full parsing covers JSON-LD.
- Validation happens by opening Google's Rich Results Test or validator.schema.org, not inside the extension.
- It is listed for Chrome, and the vendor says it works in other Chromium-based browsers; there is no Firefox or Safari version named.
- The Chrome Web Store notes the developer has not identified itself as a trader, so EU consumer rights do not apply.
Key features
Detailed SEO Extension
- Page overview
- Shows the title tag, meta description, meta robots and X-Robots-Tag header for the page you are on, with a quick link to its sitemap.xml.
- Headings view
- Lists every heading tag indented by level, with a button that copies them all to the clipboard.
- Links and images export
- Exports all links on a page and shows whether each is nofollow or sponsored; image URLs can be downloaded as a CSV file.
- Schema and hreflang
- Shows a page's structured data markup and all its hreflang alternates, with status codes and a check that each alternate links back.
- People Also Ask extraction
- An option on the Advanced tab extracts People Also Ask questions from Google results, including several levels deep.
- Right-click shortcuts
- Open the current page or site in Ahrefs, Moz, Majestic, Semrush, Similarweb or Archive.org, or run a site: search, from the context menu.
SEOMarkup Schema Inspector
- JSON-LD tree view
- Parses every JSON-LD script block, splits @graph arrays into separate schemas and shows each as an expandable tree.
- Full-text search
- Search for a property name, value or URL across all schemas on the page, with next and previous match buttons.
- Copy, download, validate
- Copy a schema as raw JSON or a ready-to-paste script tag, download it as a .json file, or open the page in Google's Rich Results Test or validator.schema.org.
- Parse error banners
- When a JSON-LD block is malformed, a banner shows which block broke and why.
- Microdata and RDFa detection
- Flags when a page also uses Microdata or RDFa, though only JSON-LD is shown in full.
- Schema.org links
- Click any schema type to open its documentation on Schema.org.
Plans
Detailed SEO Extension
Free$0
Every feature of the extension, free to install from the Chrome Web Store or Firefox Add-ons.
SEOMarkup Schema Inspector
Free$0
Every feature of the extension, free from the Chrome Web Store with no account.
Common questions
Which is cheaper, Detailed SEO Extension or SEOMarkup Schema Inspector?
As of Oct 23, 2026, both Detailed SEO Extension and SEOMarkup Schema Inspector are free to use.
Which has a free plan, Detailed SEO Extension or SEOMarkup Schema Inspector?
As of Oct 23, 2026, both Detailed SEO Extension and SEOMarkup Schema Inspector have a free plan.
More comparisons
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- Detailed SEO Extension vs SEO META in 1 CLICK
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- Detailed SEO Extension vs SEO Pro Extension
- Detailed SEO Extension vs SEO Minion
- SEOMarkup Schema Inspector vs Google Rich Results Test
- SEOMarkup Schema Inspector vs Schema Markup Validator
- SEOMarkup Schema Inspector vs Sprout SEO
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.