Overview
Local security header audit. Runs offline. Made by YvonLabs.
HeaderCheck is a lightweight, privacy-respecting Chrome extension that analyzes HTTP response headers for the active tab and evaluates a site's security and privacy posture. It uses a deterministic weighted scoring model (SCM-2025.1) to calculate a 0–100 score based on the presence and validity of key security headers, including CSP, HSTS, COOP, COEP, CORP, Referrer-Policy, Permissions-Policy, X-Frame-Options, and X-Content-Type-Options. • Instant analysis • No remote calls or telemetry • Graded vs informational headers for clarity • Clean, minimal interface • Focused on modern browser security and privacy best practices • EU-aligned philosophy emphasizing transport integrity and referrer minimization HeaderCheck runs entirely on-device inside Chrome’s extension sandbox. No data leaves your browser, ever.
Details
- Version0.3.0
- UpdatedDecember 2, 2025
- Size150KiB
- LanguagesEnglish (United States)
- DeveloperWebsite
Email
yvonlabs.plentiful987@passmail.net - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
Support
For help with questions, suggestions, or problems, visit the developer's support site
