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