Drevik – Expiry Monitor

Drevik – Expiry Monitor helps you track the TLS certificates your websites and services depend on and catch expiration problems before they become outages. Add a domain and Drevik opens a real TLS connection to inspect the certificate that host is serving right now, rather than relying on a cached database. Each tracked domain shows its expiry status, remaining lifetime, subject, issuer, serial number, signature algorithm, key size, SHA-256 fingerprint, and CA status. Drevik also displays the full certificate chain, including leaf, intermediate, and root certificates, so you can inspect every part of the trust path. Hostname coverage is checked against subject alternative names and wildcard rules to help identify certificates that are valid but do not match the domain being served. A lifetime bar shows where each certificate sits between issuance and expiry, making missed renewals easier to spot. Every check is saved locally, and when the leaf certificate fingerprint changes, Drevik records that a replacement certificate was observed and when it first appeared. Local reminders can notify you 30, 14, 7, and 1 day before expiry, with an immediate alert for certificates that are already expired. A dedicated Reminders screen shows scheduled alerts and notification permission status, while built-in guides explain certificate chains, expiry, SANs, wildcards, self-signed certificates, and common renewal cycles. No account, analytics, advertising, or tracking is required, and your tracked domains and history remain on your device. Terms of Use Link: https://docs.google.com/document/d/1qDZLInR1TW86AV3bNH9kjJaGX3uw2Db6ZWekhwX1L80/edit?tab=t.4bw2cn4pmur5 Privacy Policy: https://docs.google.com/document/d/1qDZLInR1TW86AV3bNH9kjJaGX3uw2Db6ZWekhwX1L80/edit?tab=t.0