StatusCake

StatusCake monitors websites and servers: uptime checks from locations around the world, page speed, SSL certificate expiry and domain expiry, with alerts by e-mail and through integrations such as Slack. Monitors can also be managed in code, with the REST API, the cakectl command-line tool, SDKs and Terraform. Free plan with 10 uptime monitors checked every 5 minutes, plus one page speed, one SSL and one domain monitor; paid plans for faster checks and more monitors.