Anyone who runs a server spends a good part of the time answering the same questions: is the server down or is it me, why is it stuttering, which version is it really running, how do I make its presentation in the list look decent. Each of those questions has an objective answer, and what is almost always missing is a tool that reads the raw data and translates it.
That is why we built these utilities. They came out of support: they are the checks our team used to run by hand every day, turned into a public page. They stayed free because the cost of keeping each one running is low and because a good diagnosis prevents tickets, both for customers and for people who are not.
They all run in the browser, in Portuguese, with no sign-up and no limit on reasonable use. There is no paid version hidden behind a button: what is on the page is the whole product.