How we compare

Every one of these leads with where the other product is better, because you have their pricing page open in the next tab and we would rather you trusted the rest of the page.

AlertKite vs UptimeRobot
UptimeRobot is a good product with a genuinely generous free tier. Here is where each of us actually wins.
AlertKite vs Pingdom
Pingdom is a serious product with two decades behind it. It is also priced for companies with a procurement process, which is the real difference.
AlertKite vs Better Stack
Better Stack — formerly Better Uptime — is the closest modern competitor and a genuinely well-made product. The difference is who it is for.
AlertKite vs StatusCake
StatusCake gives away a lot of monitors. What it does not give away is a way to hear about them quickly.
AlertKite vs HetrixTools
HetrixTools is a sysadmin's tool, and a good one. We are built for the person looking after other people's websites.

The short version

Most of these are good products. The question is rarely which one checks a URL more correctly — they all do that — but whether the alert reaches you somewhere you actually read, and whether you can show the person paying you that the site stayed up. Those are the two things we built for.