Several website status monitoring tools

Several website status monitoring tools

How do you know if your website is down? You can use the following online monitoring tools:

Basic Information

Site	Check Interval (minutes)
Siteuptime	30
Site24x7	60
Hosttracker	30
Cloudmonitor	15
Mon. itor. Us	30

Test

I have registered the above five services and added sites to be monitored.
Next, let the monitored site return the 403 error () on the host ).

Result

Monitoring
13:14 hosttracker
13:18 siteuptime
13: 27 site24x7
Hosttracker, if the site remains down, it will receive an email from hosttracker every 30-50 minutes.
I didn't receive an email from mon. itor. Us. It is estimated that the 403 error is not caused by the host down, but the permission is incorrect.

Update: After I set the site error to 500, I receive an email from mon. itor. Us.

Mon. itor. Us and site24x7 both verify the website and send emails at half a point.

Update2: After the website is set to normal (), the result is as follows:
17: 30 site24x7
17: 32 mon. itor. Us
Monitoring
17: 49 hosttracker
17: 56 siteuptime

Update3: Prepare to set the website to 500 error at. test again.
9:58 siteuptime
10: 02 monitoring site
10: 03 mon. itor. Us
10:05 hosttracker
10: 34 site24x7

Update4: Prepare to restore the website.
Monitoring
11: 28 siteuptime
Mon. itor. Us
11: 34 site24x7
11: 48 hosttracker

Summary

In general, these services are good.
I am too lazy to make a detailed summary.