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Schema.dev alternatives · Technical SEO

Open-source alternatives to Schema.dev

Schema.dev is not described as open source on its own site. 8 of the 83 other technical SEO tools in this directory are open source, according to their own sites.

Schema.dev is free to use. All of them are free or have a free plan.

8 tools · Listings checked up to Oct 23, 2026 · Where the facts come from

How each one differs from Schema.dev

  1. sitespeed.io

    Free open-source toolkit for testing and monitoring web performance

    • sitespeed.io is free. Schema.dev is free.
    • Only sitespeed.io lists macOS, Windows and Linux apps.
    • Only Schema.dev lists a browser extension.
    • sitespeed.io is open source and self-hostable, according to its own site.
    sitespeed.io pricing and details

  2. Unlighthouse

    Free open-source tool that runs Lighthouse on every page of a site

    • Unlighthouse is free. Schema.dev is free.
    • Only Unlighthouse lists macOS, Windows and Linux apps.
    • Only Schema.dev lists a browser extension.
    • Unlighthouse is open source, according to its own site.
    Unlighthouse pricing and details

  3. Lighthouse

    Google's open-source audit of page speed, accessibility and SEO

    • Lighthouse is free. Schema.dev is free.
    • Only Lighthouse lists a web app.
    • Lighthouse is open source, according to its own site.
    • Lighthouse also covers site audit and page speed.
    Lighthouse pricing and details

  4. Yellow Lab Tools

    Free open-source audit of a page's speed and front-end code

    • Yellow Lab Tools is free. Schema.dev is free.
    • Only Yellow Lab Tools lists a web app.
    • Only Yellow Lab Tools lists macOS and Linux apps.
    • Only Schema.dev lists a browser extension.
    Yellow Lab Tools pricing and details

  5. SiteOne Crawler

    Free open-source site crawler and audit report, as an app or CLI

    • SiteOne Crawler is free. Schema.dev is free.
    • Only SiteOne Crawler lists macOS, Windows and Linux apps.
    • Only Schema.dev lists a browser extension.
    • SiteOne Crawler is open source, according to its own site.
    SiteOne Crawler pricing and details

  6. SEOnaut

    Open-source SEO site audit tool, self-hosted or in the cloud

    • SEOnaut starts at $9 per month, billed monthly. Schema.dev is free.
    • Only SEOnaut lists a web app.
    • Only Schema.dev lists a browser extension.
    • SEOnaut is open source and self-hostable, according to its own site.
    SEOnaut pricing and details

  7. LibreCrawl

    Free open-source SEO crawler you run in your own browser

    • LibreCrawl is free. Schema.dev is free.
    • Only LibreCrawl lists a web app.
    • Only LibreCrawl lists Windows, macOS and Linux apps.
    • Only Schema.dev lists a browser extension.
    LibreCrawl pricing and details

  8. squirrelscan

    Open-source site audit CLI whose fixes are written for coding agents

    • squirrelscan starts at $19 per month, billed monthly. Schema.dev is free.
    • Only squirrelscan lists a web app.
    • Only squirrelscan lists macOS, Windows and Linux apps.
    • Only Schema.dev lists a browser extension.
    squirrelscan pricing and details

Common questions

Is there an open-source alternative to Schema.dev?

Yes. sitespeed.io, Unlighthouse, Lighthouse, Yellow Lab Tools, SiteOne Crawler, SEOnaut, LibreCrawl and squirrelscan are open source, according to their own sites.

Is Schema.dev open source?

Schema.dev is not described as open source on its own site. The listing was checked on Oct 23, 2026 against the pages it cites.

When was this checked?

Every listing on this page was checked on Oct 23, 2026, against the pages it cites. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Schema.dev: the alternatives its listing names first, then the tools that share the most features with it.