# SEOMarkup Schema Inspector review (2026): is it any good? > Free, open-source Chrome extension that shows a page's JSON-LD Checked Oct 23, 2026 ยท graded Oct 23, 2026 by ToolGPA. SEOMarkup Structured Data Schema Inspector is a free Chrome extension that reads every JSON-LD block on the page you are on and shows it as a searchable tree. Each schema can be copied as JSON or as a script tag, downloaded, or sent to Google's Rich Results Test and the Schema.org validator. It is open source under the MIT license, needs no account and makes no network requests of its own. - **Category:** SEO Browser Extensions - **Made by:** SEOMarkup - **Website:** https://chromewebstore.google.com/detail/seomarkup-structured-data/gaclifbkjcockpefkcjpgggmeolckind - **Runs on:** Browser extension - **Who should skip it:** Skip it if the page uses Microdata or RDFa, which are only flagged, not shown. - **Facts last checked:** Oct 23, 2026 ## Pricing As of Oct 23, 2026, SEOMarkup Schema Inspector is free to use. - **Pricing model:** Free - **Free plan:** 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. | Plan | Price | What you get | | --- | --- | --- | | Free | $0 | Every feature of the extension, free from the Chrome Web Store with no account. | Read from https://www.seomarkup.site/ on Oct 23, 2026. Prices change, so confirm with SEOMarkup Schema Inspector before buying. ## Key features - **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. ## Good for - Developers debugging structured data before a release - SEOs checking which schema types a competitor uses - Copying a working schema block as a starting template ## Worth knowing - 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. ## ToolGPA grades **GPA: 2.8 out of 4**, graded Oct 23, 2026. SEOMarkup Schema Inspector shows every JSON-LD block on a page as a searchable tree you can copy, download or send to Google's Rich Results Test, free and open source. That's all it does: Microdata and RDFa are only flagged, not shown, validation happens on Google's and Schema.org's sites, and it runs in Chromium browsers only. - **Value for money: A.** Free for good and open source under the MIT license, with no paid tier, trial or card. - **Free plan and trial: A.** Free outright: every feature in the extension, with no account needed. - **Features: D.** One 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: B.** No 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: C.** Chrome 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. These are ToolGPA's own grades. Graded from this listing, whose facts were read from SEOMarkup's own site and its Chrome Web Store listing on 23 October 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among SEO browser extensions - SEOMarkup Schema Inspector's GPA of 2.8 is higher than 4 of the 34 other SEO browser extensions we grade, and level with 12. - It stands best on free plan and trial (A, above 5 of 34) and worst on features (D, above 0). - SEOMarkup Schema Inspector has no paid plan. - On features, ease of use and platforms it scores 2.0 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price. The category's chart of price against score: https://toolgpa.com/charts/seo-extensions ## Keep it, or make your own? **Keep it.** SEOMarkup Schema Inspector is free, so making your own would save you nothing. That makes this kind of software worth paying for, not this one in particular: 18 of the 34 other SEO browser extensions grade higher. - You could make: Schema markup: an app builder makes this well. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Google Rich Results Test, Schema.org validator **Tags:** Schema markup, Open source ## Alternatives - [Google Rich Results Test](https://toolgpa.com/tools/google-rich-results-test): Free Google check of which rich results a page's structured data earns. [Compare](https://toolgpa.com/compare/google-rich-results-test-vs-seomarkup-schema-inspector) - [Schema Markup Validator](https://toolgpa.com/tools/schema-markup-validator): Free schema.org checker for any structured data on a page or snippet. [Compare](https://toolgpa.com/compare/schema-markup-validator-vs-seomarkup-schema-inspector) - [Detailed SEO Extension](https://toolgpa.com/tools/detailed-seo-extension): Free Chrome and Firefox extension for one-click on-page SEO checks. [Compare](https://toolgpa.com/compare/detailed-seo-extension-vs-seomarkup-schema-inspector) - [Sprout SEO](https://toolgpa.com/tools/sprout-seo): Free on-page SEO extension for Chrome, Firefox and Edge. [Compare](https://toolgpa.com/compare/seomarkup-schema-inspector-vs-sprout-seo) ## Sources The prices, plans, platforms and features above were read from these pages on Oct 23, 2026: - https://www.seomarkup.site/ - https://chromewebstore.google.com/detail/seomarkup-structured-data/gaclifbkjcockpefkcjpgggmeolckind Page: https://toolgpa.com/tools/seomarkup-schema-inspector Listed by ToolGPA (toolgpa.com).