TLSCheck is a Chrome add-on designed to verify the validity of TLS/SSL certificates, including their revocation status. This tool simplifies the process of assessing domain trustworthiness with a user-friendly interface that provides clear indicators of certificate reliability. It is particularly useful for web developers and security-conscious users who need quick insights into the security of their connections.

The tool leverages OCSP and CRL methods for revocation checking, ensuring that users receive accurate information about certificate status. Additionally, TLSCheck offers an open-source and self-hostable API, allowing users to maintain control over their privacy. For those looking for an easy start, a free hosted API is available, providing a convenient solution for certificate validation.