For our company, we had to create our own status monitoring app (open source). It's been a while and I had a short amount of time to find one.

A few reason for why we built our own:

- almost no SaaS allow companies to make advanced (JSON) checks to the data returned by a status endpoint. For example, we have cron jobs running data imports. To verify that these are still running, a /status endpoint on our app returns the last data import date based on the data imported in the DB. If this delay gets bigger than a threshold then we fire an alert.

- we're in B2B. Our clients need to have access to a status page with the ability to download the list of incidents (for SLA & contractual purposes)

- we need 2 levels of status pages. One for customers and one for our internal teams with access to more monitors

- SaaS providers either give the ability to automatically monitor or to manually manage the status page. There is no ability to do both at the same time

- I wanted something simple. And advanced monitoring systems can definitely do the above, but it's ops hell to setup and maintain. I have other things to do.