Automating your favourite browser to load and screenshot each version 
and then using http://www.imagemagick.org/Usage/compare/ should work.

Note that this will also catch the scenario where someone has changed 
the page by changing an image on the page.

cheers
stuart

On 24/04/13 10:18, Wilhelmina Randtke wrote:
> That helps a lot, because it's for websites which is what I want to compare.
>
> I am looking for changes in a site, and I have some archives, but tools for
> merging code are too labor intensive and don't give a good visual report
> that I can show to a supervisor.  This is good moving forward, but doesn't
> cover historical pages.
>
> I was hoping for something where I could call up two pages and get a visual
> display of differences for the display version of html, not the code.
>
> -Wilhelmina
>
> On Tue, Apr 23, 2013 at 5:14 PM, Pottinger, Hardy J. <
> [log in to unmask]> wrote:
>
>> Hi, I'm not sure if you're really looking for a diff tool, so I'll just
>> shout an answer to a question that I think you might be asking. I use a
>> variation of the script posted here:
>>
>> http://stackoverflow.com/questions/1494488/watch-a-web-page-for-changes
>>
>>
>> for watching a web page for changes. I mostly only ever use this for
>> watching for new artifacts to appear in Maven Central (because refreshing
>> a web page is pretty dull "work").
>>
>> Hope this helps.
>>
>> --
>> HARDY POTTINGER <[log in to unmask]>
>> University of Missouri Library Systems
>> http://lso.umsystem.edu/~pottingerhj/
>> https://MOspace.umsystem.edu/
>> "Do you love it? Do you hate it? There it is, the way you made it."
>> --Frank Zappa
>>
>>
>>
>>
>>
>> On 4/23/13 3:24 PM, "Wilhelmina Randtke" <[log in to unmask]> wrote:
>>
>>> I would like to compare versions of a website scraped at different times
>>> to
>>> see what paragraphs on a page have changed.  Does anyone here know of a
>>> tool for holding two files side by side and noting what is the same and
>>> what is different between the files?
>>>
>>> It seems like any simple script to note differences in two strings of text
>>> would work, but I don't know a tool to use.
>>>
>>> -Wilhelmina Randtke
>>
>


-- 
Stuart Yeates
Library Technology Services http://www.victoria.ac.nz/library/