Schema.dev vs Schema Markup Validator (2026): which should you pick?

Pick Schema.dev if

• Fits if you mark up a handful of pages and can paste JSON-LD into your CMS
• Works for checking what structured data a page already has

Look elsewhere if

• Skip it if you don't use Chrome, as it's a Chrome extension only
• Too light for whole sites, as markup is built page by page and the Deployer isn't out
• Watch out: the extension's latest version, 0.80.1, is from March 2025, and the site's newest blog posts are from 2020
• Tight if you want the Schema Tester or its API, which sit in a beta behind a sign-up
• Not for you if you want the markup added for you, as you copy and paste it yourself

Pick Schema Markup Validator if

• Fits if you're a developer checking that schema.org markup is well formed
• Works for sites using structured data for engines and apps other than Google

Look elsewhere if

• Skip it if you want to know about Google rich results, which need Google's Rich Results Test
• Too light for a whole site, as it checks one URL or snippet per run
• Not for you if you want saved history or scheduled checks, as the page offers neither
• Watch out: it's hosted by the schema.org community project, not a company selling support

Schema.dev

• It works only as a Chrome extension; there is no plugin that adds the markup to your site for you.
• The Schema Tester and its API are a beta behind a sign-up, and the Schema Deployer is still marked as coming soon.
• The extension's latest version, 0.80.1, dates from March 2025, and the site's newest blog posts are from 2020.
• Markup is built page by page; templates that cover many pages at once are planned for the unreleased Deployer.

Schema Markup Validator

• Does not tell you whether a page qualifies for Google rich results; Google's Rich Results Test does that.
• Tests one URL or one snippet per run; the page offers no site crawl, scheduling or saved history.
• Hosted by the schema.org project, a community effort founded by Google, Microsoft, Yahoo and Yandex, not a company selling support.

Schema.dev

Point-and-click builder

A step-by-step form for each schema type, filled by clicking elements on the page or typing, with text transformations and custom values.

Dozens of schema types

Covers the types Google supports for rich results and more; the March 2025 update added vehicle listing markup.

Required and recommended fields

Guides you through the required, recommended and optional properties for each type, so less schema knowledge is needed.

Detection and testing

Finds structured data already on a page and tests generated markup, showing errors and warnings.

JSON-LD output

Produces formatted JSON-LD that you copy and paste into the page or your CMS.

Schema Markup Validator

Fetch a URL

Enter a page address and the validator fetches the page and checks the structured data embedded in it.

Test a code snippet

Paste markup into the editor to check it before it is published, and rerun the test after each change.

Any schema.org type

Checks syntax and compliance with schema.org standards for every type in the vocabulary, not only the ones Google uses for rich results.

No Google-specific warnings

Google describes it as validating schema.org data without Google feature-specific warnings, which its Rich Results Test covers instead.

Interface in many languages

The validator's interface can be switched between dozens of languages, including Japanese, German, Hindi, Arabic and Spanish.

Schema.dev

• Free$0

  The Schema Builder extension for Chrome with built-in testing, plus the Schema Tester beta.

Schema Markup Validator

• Free$0

  Validates schema.org markup from a fetched URL or a pasted code snippet, with the interface in several languages.