WeVividWeVividCheck a site's SSL certificate and expiry date.
Reading another site's TLS certificate details requires a direct network connection to it, which browsers don't expose to JavaScript. This connects from a small WeVivid server endpoint instead.
It means the certificate didn't pass standard trust validation — this can happen with expired certificates, self-signed certificates, or a hostname mismatch. It's worth investigating before that certificate is relied on for production traffic.
Most services flag renewal at 30 days remaining — this tool highlights that window in red so you don't miss it.