Email Rendering Linter

Terminal and CI linter that checks HTML email against 21 email clients.

Desktopfreeglobal

This tool is a free, open-source rendering linter for HTML email that runs in a terminal or CI pipeline, checking markup against 255 CSS and HTML features across 21 real email clients. It's built for email developers and marketers who need to catch rendering bugs before sending, without an account or manual testing across every client.

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