Looking for software to continuously test web browsing

Just write a script running curl in a loop with a sleep...

PERLish snippet...

while (1) {
     system("date && curl -I -L $host | egrep -i ^HTTP");
     sleep 30;
}

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This will run the command every 30 seconds, reporting the status code returned by the Webserver.

https://UptimeRobot.com provides a service for this too.

Since I'm IT, it's best if I monitor some sites too. Since I like my own solutions (PUSH alerts), I had to write my own solution:

https://drive.google.com/file/d/17yyc2gdfutthrPPs2Fc3iFLFXGDJPDX2/view?usp=sharing

Read the config file, and it probably speaks for itself. It does a keyword check, because there's a difference between a real working site (keyword is always there), and an error/service halted page (keyword won't be there). So choose the keyword based on that knowledge (unique to site up and running)

Consult the local log file later to see when happened. GUI shows what currently is going on (hover the colored cell for extra info)

This is a little different than what you asked for, in that it doesn't try to load and render a web page, but rather pings three hosts.  I use this to keep an eye on my ISP at home so I have some data about any outages of my internet connection.  Depending on what you are really trying to establish it might be a fit, and it works well and logs outages, so I wanted to mention it.

Net Uptime Monitor - the simple Internet Connection Monitor

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»bp

Hi David, I don't think uptime robot will work, as that just checks if a website goes down I don't need to check the uptime of a website.  I need to simulate my typing a website and seeing if it comes up like I'm at the keyboard of the computer, probably every 15 seconds.

Bill, thanks, but when the HTTP goes down, pinging still works, so that won't help.

Okay, fair enough, just thought I'd mention it...

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»bp

Kimputer, I ran the file against virustotal.com and 4 different engines found it to be malicious, so not sure if that is on purpose or not, but if it's not, if it's legit, you might want to change the code.  I'm suspecting it is malicious, as usually, when I get a false positive, it's 1-2 engines, but I got 4 different ones caught it.

David, since I don't write code, I wouldn't be able to write it.   For example, since you are saying it's simple, can you code it to check cnn.com, or any website that is short, every 15 seconds.  Can it log every try?

How would I even run the script, I have never used perl.

I think the default time-out when you can't connect is 60 seconds.  

David Johnson, do I just put that into a batch file?  I don't see where i can specify where to save the log file?
Just not sure how to run the code you mentioned?

Simple shell one-liner in bash...

while : ; do curl -s -I -L https://cnn.com/ | egrep -i ^HTTP && sleep 30 ; done

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If coding isn't your... forte/skill/thang... use https://UptimeRobot.com instead...

It is a powershell script save it as a filename.ps1 file
add the following after line 19

 write-output -InputObject ("Site Down: $now Status: $statuscode") | Out-File C:\temp\failure.log -Append

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Written in VB.net, extremely simple code. Since .Net code can be easily decompiled/disassembled, the 4 hits you got, were from the "lazy" vendors, they only flagged it since it's not signed. Obviously I write my own tools, so I can't sign it officially like software vendors to for their commercial products.
Real malware takes a day for all antivirus vendors to keep up. "Legit" malware would be over 30 hits after a day or so.