Compare software

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

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