Is it down for everyone, or just for you?
Paste the address of any public site and this page checks it from three regions at once, which separates a site that is genuinely down from a single network path having a bad minute.
Checks are free and nothing is stored. The checker only reads the address you give it, and each visitor gets a fair share of checks per minute so the probes stay honest for everyone.
Here is how the verdict works: probes in New York, Frankfurt and Singapore each load the address, and the site is only called down when at least two of the three regions agree it is down. That 2 of 3 vote is the same one DownForReal runs before any customer alert is allowed to fire, so a broken route in one region cannot page anyone on its own.
If you run something that other people depend on, DownForReal watches it around the clock with this vote in front of every alert, keeps your status page mirrored on a separate host, and costs ten dollars a month flat. Start the free 14 day trial and your first monitor takes about a minute to set up.