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That one website that grades a website's security settings

Why it's the pick

Security Headers gives any site an A+ to F grade for the protections it tells browsers to use, like HSTS, CSP and X-Frame-Options, and explains each missing one. It's free, needs no account and is run by the security company Snyk.

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Also good

HTTP Observatory developer.mozilla.org Mozilla's free scan of a site's security headers and setup FreeNo signup Link checked Oct 9

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