SSL Quick Check

Full description:

SSL Quick Check helps you keep an eye on the SSL/TLS certificates of the websites and servers you care about.
Add any domain and see its certificate details at a glance: expiry date, issuer, certificate chain, and negotiated protocol version. The app connects directly to the domain you enter to read its public certificate — nothing is sent to us or to any third party.
Key features:

Add and organise multiple domains in one list
View expiry date, issuer, protocol and chain details for each certificate
Spot certificates that are expiring soon or already invalid
Group and manage your sites for quick daily checks

Built for privacy: SSL Quick Check runs entirely on your device. There is no account, no backend server, no ads, and no tracking. Your list of domains stays on your device.
Whether you're a developer, a system administrator, or just someone who wants to avoid surprise certificate expirations, SSL Quick Check gives you a fast, simple way to stay on top of your sites' SSL/TLS health.