Quantum Guard is a free Chrome add-on designed to enhance your online security by analyzing the TLS security of websites you visit. It detects if a website utilizes post-quantum cryptography (PQC), a new security standard aimed at protecting against future quantum computer threats. With its intuitive interface, the add-on changes color based on the security level of the TLS protocol used by the website, providing users with immediate visual feedback about their connection's safety.

The tool offers detailed insights upon clicking the icon, including the negotiated TLS protocol, key exchange algorithm, cipher suite, and certificate issuer information. By addressing the looming threats posed by quantum computing, Quantum Guard ensures that users are informed about the readiness of websites against potential quantum attacks. It prioritizes user privacy by only sending domain names for analysis and does not collect personal data, making it a reliable choice for those concerned about online security.