How to check if my website this ON?

With Selenium language, is very easy. Only need installed selenium python library.

Simple example using Selenium library

browser = webdriver.Firefox()
browser.get('http://google.es')
assert 'Google' in browser.title

In this example only checked if google.es has the "Google" title.

Now, if don't has the correct title the webs site, takes a screenshot.

browser = webdriver.Firefox()
browser.get('http://google.es')
if 'Google' not in browser.title:
    base64 = browser.get_screenshot_as_base64()

Finally, you can program tasks to check your websites and send email on error. If you want see the full example code go to this url Github/Endika/test_script/checkWebsite.py