I am excited to launch IncidentOK(https://incidentok.com/) MVP. It is the health check product which sends alert if any third party products like AWS, Slack, Gmail has an outage. Companies are dependent on many third party products. Outage on those products impacts internally or to their customers.
To be more proactive for yourself or for customers, IncidentOK will raise the alert whenever subscribed service has an outage.
I am still validating the idea. So, feedback are always welcome :)