Wikipedia
Pingdom
Pingdom is a service that tracks the uptime, downtime, and performance of websites. Based in Sweden, Pingdom monitors websites from multiple locations globally so that it can distinguish genuine downtime from routing and access problems.
Sam Nurmi is the CEO and founder of the company.
Pingdom has criticized Google's claims of downtime for Google Apps on the grounds that Google does not measure periods of downtime less than 10 minutes in length. Google responded to these criticisms by pointing out that Pingdom's criticism was based on a hypothetical scenario, and not on real data.
On 18 June 2014 they announced they had been purchased by SolarWinds.