From AlertFox Website Monitoring
Sample website performance checks are available in the demo account:
You can log into our demo account as a "read only" user. The login details are: user name = email@example.com, password = demo.
There you can see sample DNS, HTTP and iMacros real browser monitoring sensors. Some iMacros sensors are set up to trigger an error on purpose, so you can see the useful "browser screenshot on error" feature.
The "Test Now" feature also works in the demo mode. You can run all tests on demand: