AdminKit vs SecurityHeaders.com
SecurityHeaders.com, a Snyk project ('Powered by Snyk', securityheaders.com, read 2026-10-29), has logged more than 405 million scans and grades a URL's response headers A+ down to F; AdminKit's HTTP security-headers check reads the same kind of response headers but reports each one present/missing with its actual value rather than a single letter grade, and this page states that difference plainly instead of implying AdminKit's check is a drop-in replacement for an established, large-scale scanner.
What each tool actually checks today
SecurityHeaders.com, read 2026-10-29, describes itself as “Powered by Snyk” and “A snyk.io project” in its own footer, with more than 405 million scans logged. It fetches a URL you enter and grades the response A+ down to F (with an “R” grade for a redirect result), based on which security headers are present and how they’re configured. A sample report for scotthelme.co.uk, read 2026-10-29, shows the specific headers it evaluates: Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options, X-XSS-Protection, Referrer-Policy, Permissions-Policy, Cross-Origin-Resource-Policy and X-Frame-Options, plus report-only Cross-Origin-Embedder-Policy and Cross-Origin-Opener-Policy and Network-Error-Logging/Report-To directives. Its own homepage offers a “Scan your site now” flow with no payment or account requirement stated for a basic scan.
AdminKit’s HTTP security headers check fetches the URL you enter and reports whether each recommended header (CSP, HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy) is present, with its actual value shown for each one that is, the final URL reached if the site redirects, and specific flagged issues with a plain-language fix hint. It does not compute an overall letter grade, and reads one fetch of the URL rather than crawling a whole site.
The honest angle
AdminKit is not claiming to match SecurityHeaders.com’s scan volume or its widely recognized A+-to-F grade — a scoring system built up over years and now backed by Snyk is a different kind of credibility than a newer checklist-style check, and this page says so rather than implying equivalence. Where AdminKit’s check differs in approach, not necessarily depth, is showing each header’s actual sent value and a fix hint directly in the result, as one part of a combined report next to AdminKit’s SSL/TLS, DNS and mail-authentication checks, rather than a single standalone score.
If what you want is a shareable letter grade with a long track record behind it, SecurityHeaders.com is the established choice. If what you want is a quick checklist of exactly which headers are missing and what to add, shown next to your certificate and DNS results in one place, that’s what AdminKit’s check is for. Either way, remember that a good grade or a “Present” result is a configuration checklist, not a guarantee a site has no other vulnerabilities.
Trademarks belong to their respective owners; AdminKit is not affiliated.
| Feature | AdminKit | SecurityHeaders.com |
|---|---|---|
| Free, no account required | ✓ | ✓ |
| Live fetch of the URL's response headers | ✓ | ✓ |
| Overall letter grade (A+ to F) | — | ✓ |
| Shows the actual value of each header present, not just present/missing | ✓ | Unverified — not confirmed from own pages |
| Plain-language fix hint per missing/weak header | ✓ | Unverified — not confirmed from own pages |
| Checks TLS certificate or cookie security alongside headers | — | — |
| Combined report alongside SSL/TLS, DNS, MX and other checks | ✓ | — |
AdminKit vs SecurityHeaders.com
Overall letter grade (A+ to F)
Shows the actual value of each header present, not just present/missing
Plain-language fix hint per missing/weak header
Combined report alongside SSL/TLS, DNS, MX and other checks
Last checked
Sources: SecurityHeaders.com — homepage, SecurityHeaders.com — example scan report
Frequently asked questions
Does AdminKit give a letter grade like SecurityHeaders.com?
No. SecurityHeaders.com's own homepage shows an A+-to-F (and R) grading scale built up across more than 405 million scans. AdminKit's HTTP security-headers check instead lists each recommended header (CSP, HSTS, X-Content-Type-Options, Referrer-Policy, Permissions-Policy and more) as present or missing, with the actual value shown for each one that is present, plus a plain-language fix hint — a checklist rather than a single score.
Is SecurityHeaders.com free?
Yes, based on current evidence: its own homepage offers a 'Scan your site now' feature with no payment mentioned and no account requirement stated for a basic scan. AdminKit's check is also free with no account required.
Who operates SecurityHeaders.com?
Per its own homepage footer, read 2026-10-29, it is described as 'A snyk.io project' and 'Powered by Snyk.' AdminKit has no affiliation with Snyk.
Why would I use AdminKit's check instead of SecurityHeaders.com?
If you want a single, widely recognized letter grade to share or track over time, SecurityHeaders.com is the established tool with scan volume AdminKit does not have. AdminKit's check is aimed at a quick, no-frills read of exactly which headers are present or missing and what fix each gap needs, shown alongside AdminKit's other checks (SSL/TLS, DNS, MX) in one report rather than as a scored, standalone grader.
Does this page use SecurityHeaders.com's or Snyk's logo or brand assets?
No. This page refers to SecurityHeaders.com and Snyk by name only (nominative use) to describe and compare a publicly available tool. AdminKit is not affiliated with or endorsed by Snyk Ltd.
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