Siteguardian is a simple but robust site monitoring service, offering a wide spread of security and uptime checks.
During Beta all users will be onboarded on our free plan, as we progress we will continue adding new plans.
Siteguardian will periodically download and analyze your website certificates not just for expire but also to ensure changes to infrastructure aren't changing your certificates without you noticing.
We would love to get your ideas! Send us a note with your ideas to firstname.lastname@example.org.