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The SEOMarkup Schema Inspector Insider’s Guide

Everything we know about SEOMarkup Schema Inspector in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.

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ToolGPAOctober 2026

SEOMarkup Schema Inspector

The Insider’s Guide

Free, open-source Chrome extension that shows a page's JSON-LD

Every plan, grade, refund rule and rival among SEO browser extensions, read from SEOMarkup Schema Inspector’s own pages.

Made by SEOMarkup · checked Oct 23, 2026 · toolgpa.com

2.8GPA

Contents

  1. 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
  2. 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
  3. 03What it doesIts main features, where it runs, what it works with and who makes it
  4. 04Where it standsIts grades against its category, and whether to keep it or make your own
  5. 05The alternativesThe tools it is most often weighed against, side by side
  6. 06Quick answersThe questions people ask about it, each answered in a line or two
  7. 07About ToolGPAWho made this guide, what else is on the site, and how to cite it

ToolGPA put this guide together from SEOMarkup Schema Inspector’s own pages, its app-store listings and our grades. Every fact in it is on SEOMarkup Schema Inspector’s page too, where it is kept up to date. Checked Oct 23, 2026.

Part 01 · Overview

Welcome

What it is, who it suits, its grades and the ten things to know first

2.8

GPA, above 4 of the 34 other SEO browser extensions we grade

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.

To get you started, here are 7 things to know about SEOMarkup Schema Inspector, taken from its own pages and our grades.

No rating on record, but no account and nothing to set up: open a page, click the icon and the schemas are listed.
From our grade for ease of use
  1. 1

    Best for reading a page's JSON-LD as a tree

    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.

  2. 2

    It is free

    SEOMarkup Schema Inspector has no paid plan at all. 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.

  3. 3

    JSON-LD tree view

    Parses every JSON-LD script block, splits @graph arrays into separate schemas and shows each as an expandable tree.

  4. 4

    Full-text search

    Search for a property name, value or URL across all schemas on the page, with next and previous match buttons.

  5. 5

    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.

  6. 6

    A 2.8 GPA, above 4 of 34

    That is against the other SEO browser extensions we grade, on value, the free plan, features, ease of use and platforms.

  7. 7

    Keep it

    SEOMarkup Schema Inspector is free, so making your own would save you nothing.

SEOMarkup Schema Inspector at a glance

Pricing
Free
Free plan
Yes
Free trial
None stated
Runs on
Browser extension
Made by
SEOMarkup
Category
SEO Browser Extensions
Our grade
2.8 GPA, good

The report card

Best for reading a page's JSON-LD as a tree

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.

ToolGPA report cardSEOMarkup Schema InspectorGraded Oct 23, 2026
SubjectGradeComment
Value for moneyAFree for good and open source under the MIT license, with no paid tier, trial or card.
Free plan and trialAFree outright: every feature in the extension, with no account needed.
FeaturesDOne 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 useBNo rating on record, but no account and nothing to set up: open a page, click the icon and the schemas are listed.
Platforms and integrationsCChrome 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.
Grade point averageGood, out of 4.02.8

An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.

Who SEOMarkup Schema Inspector is for

  • 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

Who it is not for

  • 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

Good to know

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.

Part 02 · Pricing

What it costs

Every plan, the free plan, ways to pay less and how prices have moved

Free

No paid plan at all

SEOMarkup Schema Inspector is free to use.

Free for good and open source under the MIT license, with no paid tier, trial or card.
From our grade for value for money

  • Free

    $0

    Every feature of the extension, free from the Chrome Web Store with no account.

The 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.

Read from seomarkup.site on Oct 23, 2026.

Part 03 · Features

What it does

Its main features, where it runs, what it works with and who makes it

1

Place it runs: Browser extension

Free, open-source Chrome extension that shows a page's JSON-LD. Here is what it does, as its own site describes it, and what it covers: open source, schema markup.

One narrow function: JSON-LD parsed into trees, @graph split up, full-text search, copy and download, and parse error banners.
From our grade for 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.

Where it runs

  • Browser extension

What it works with

  • Google Rich Results Test
  • Schema.org validator

SEOMarkup Schema Inspector is made by SEOMarkup.

Part 04 · Standing

Where it stands

Its grades against its category, and whether to keep it or make your own

4/34

Other SEO browser extensions it is graded above

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.

Each grade against the category

Every bar is all 35 SEO browser extensions we grade, cut by the letter each got. SEOMarkup Schema Inspector’s own letter is outlined.

  • AValue for moneyAbove 4 of 34
  • AFree plan and trialAbove 5 of 34
  • DFeaturesAbove 0 of 34
  • BEase of useAbove 3 of 34
  • CPlatforms and integrationsAbove 0 of 34

Price against what you get

Each dot is one of 34 SEO browser extensions. Further left costs less; higher up scores better on features, ease of use and platforms. SEOMarkup Schema Inspector is the marked dot.

C2.0B3.0A4.0Free$5$10$20$50More for lessCosts more, scores moreCosts less, scores lessCosts more, scores lessSEOMarkup Schema Insp…SEOquakeSEO Review Tools for…Sprout SEOSerpWorx

What paid plans start at, a month (each step along is roughly double) →

Keep it, or make your own?

Whether this is something you could build for yourself with an AI app builder, and what you would give up.

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.

What you could make

  • Schema markup: an app builder makes this well.

What this rests on. SEOMarkup Schema Inspector’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.

Part 05 · Alternatives

The alternatives

The tools it is most often weighed against, side by side

Google Rich Results Test, Schema Markup Validator, Detailed SEO Extension and Sprout SEO

The 4 tools SEOMarkup Schema Inspector is most often weighed against, with where each one differs from it.

Part 06 · Questions

Quick answers

The questions people ask about it, each answered in a line or two

11

Questions, each answered in a line or two

The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.

Is SEOMarkup Schema Inspector free?

Yes. SEOMarkup Schema Inspector is free to use.

How much does SEOMarkup Schema Inspector cost?

SEOMarkup Schema Inspector lists one plan. Free: $0.

Does SEOMarkup Schema Inspector have an Android app?

No Android app was listed when its pages were read on Oct 23, 2026. SEOMarkup Schema Inspector is listed for no platform we could confirm.

Does SEOMarkup Schema Inspector have an iPhone app?

No iPhone app was listed when its pages were read on Oct 23, 2026. SEOMarkup Schema Inspector is listed for no platform we could confirm.

Is SEOMarkup Schema Inspector open source?

Yes. SEOMarkup Schema Inspector is open source, according to its own site.

What does SEOMarkup Schema Inspector integrate with?

SEOMarkup Schema Inspector's listing names Google Rich Results Test and Schema.org validator.

Who makes SEOMarkup Schema Inspector?

SEOMarkup Schema Inspector is made by SEOMarkup.

What are the alternatives to SEOMarkup Schema Inspector?

The closest alternatives to SEOMarkup Schema Inspector in our directory are Google Rich Results Test, Schema Markup Validator, Detailed SEO Extension and Sprout SEO.

How does SEOMarkup Schema Inspector compare with other 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.

Is SEOMarkup Schema Inspector good value for money?

ToolGPA grades SEOMarkup Schema Inspector A for value for money. SEOMarkup Schema Inspector has no paid plan.

Could I make my own version of SEOMarkup Schema Inspector?

SEOMarkup Schema Inspector is free, so making your own would save you nothing.

Where this guide comes from

The prices, plans, platforms and features were read from SEOMarkup Schema Inspector’s own pages on Oct 23, 2026, and the grades were given on Oct 23, 2026. 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.

Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by SEOMarkup. Prices change, so check chromewebstore.google.com before you buy.

Part 07 · About

About ToolGPA

Who made this guide, what else is on the site, and how to cite it

3,189

Tools graded, in 94 categories

ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.

Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.

  • 3,189

    tools graded

  • 94

    categories

  • 426

    price changes on record

  • 579

    apps priced in 12 countries

What else is on toolgpa.com

Scan for the live page

Prices and grades as they are today

Quoting this guide?

Please name ToolGPA and link to the live page, so readers can check the figures for themselves:

ToolGPA, "SEOMarkup Schema Inspector: The Insider's Guide", checked Oct 23, 2026. https://toolgpa.com/tools/seomarkup-schema-inspector

Know someone choosing between SEO browser extensions?

Send them this guide: toolgpa.com/tools/seomarkup-schema-inspector/guide

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See our other guides

The best-graded SEO browser extensions after SEOMarkup Schema Inspector, each with an Insider's Guide of its own.

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Choosing software? Every tool graded, every price dated.

Compare tools at toolgpa.com ›

Everything in this guide is ToolGPA’s own summary of what SEOMarkup Schema Inspector’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. SEOMarkup Schema Inspector is a trademark of its owner, and this guide is not made, paid for or approved by SEOMarkup. Prices and plans change: check chromewebstore.google.com before you buy.