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HTML-validate vs webhint: catalog facts
HTML-validate	webhint
Free Free to use, with the source code published on GitLab.	Free Free open-source project hosted by the OpenJS Foundation.
Command line	Browser extension, Command line
Validates entirely offline, so no markup is uploaded Handles HTML fragments inside Vue.js and AngularJS components	Same checks available in the editor, the browser and CI Built into Microsoft Edge DevTools
Command-line and tooling oriented, with no graphical interface Checks markup only, not CSS or accessibility in a browser	The CLI requires Node.js and npx Aimed at developers rather than site owners who want a one-click report
Downloadable app	Downloadable app, Browser extension
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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