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HTML-validate vs SuperHTML: catalog facts
HTML-validate	SuperHTML
Free Free to use, with the source code published on GitLab.	Free Free and open source under the MIT licence.
Command line	Windows, Command line
Validates entirely offline, so no markup is uploaded Handles HTML fragments inside Vue.js and AngularJS components	Validation and formatting in one tool Works as a language server in editors
Command-line and tooling oriented, with no graphical interface Checks markup only, not CSS or accessibility in a browser	Focused on HTML only No formal releases listed on the repository
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.