Alternatives to Nu Html Checker

The W3C's online checker that tests HTML documents against current HTML conformance rules. The listings below can replace it for an important use case. Each note says what changes if you switch.

  • Nu Html Checker

    The W3C's online checker that tests HTML documents against current HTML conformance rules.

    FreeProprietaryWeb

Replacements

Listings that take over the same core job as Nu Html Checker.

  • W3C Markup Validation Service

    The W3C's free service for checking the markup of HTML and XHTML documents.

    FreeProprietaryWeb

    W3C Markup Validation Service targets HTML and XHTML with doctype and encoding choices, but marks HTML5 validation as experimental.

  • Rocket Validator

    A hosted crawler that runs HTML, CSS and accessibility checks across thousands of site pages.

    PaidProprietaryWeb

    Rocket Validator is a paid hosted crawler that runs HTML and accessibility checks across up to 5,000 pages per report instead of one document.

  • AChecker

    Online accessibility checker that tests a URL, uploaded file or pasted HTML against WCAG and Section 508.

    FreeProprietaryWeb

    AChecker focuses on WCAG and Section 508 accessibility and offers HTML validation only as an option, with guidelines stopping at WCAG 2.0.

  • HTMLProofer

    A Ruby tool that tests rendered HTML files for broken links, images and markup problems.

    FreeOpen sourceWindowsmacOSLinuxCommand line

    HTMLProofer is an open-source Ruby tool that tests local rendered HTML files in CI for markup problems as well as broken links and images.

Similar software

Related functionality, not a direct replacement.