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Frequently Answered Questions (F.A.Q.)

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1) Why did you develop your diff text software when there are so many other text comparison utilities around?

Difference algorithms were first developed decades ago by a number of universities. Software utilities using them all had one drawback. They could spot in-order runs of identical sequences between two different documents, but if a line of text was moved up or down it would be treated as a deletion in the original and an unlinked addition in the modified document. We wanted to see if we could detect text movements.

You could go further than that. Suppose you are not comparing lines of computer source code, but instead an essay or newspaper article. You move the last two sentences in long paragraph to the beginning. Again off-the-shelf compare utilities will miss that. Likewise consider a very long sentence and you move ten words from the middle to the beginning. All these changes will be treated as deletions and additions rather than movements. How do you figure out what is the main body of text as opposed to that which has been moved?

Some companies do produce software that can detect text movements, but these are the exception rather than the rule. Anyway our text utility is currently free and not part of a larger software package.

We also wanted a utility in which you could switch the level at which it compares at. Our software allows you to switch from comparing whole intact lines (or paragraphs) with each other to individual words or characters. If you want to know how individual lines or paragraphs differ from each other, you should switch to comparing whole words, otherwise you will find the results disappointing.

Unless you are comparing long strings, comparing at the character level might sometimes be confusing, as sometimes the same letters will be paired up, but in the wrong order.

You shouldn’t really use a text difference utility to compare lists or data, but this is where comparing at the level of whole lines with software that can detect movements as well is useful.

Consider a comparison of the two lists below.

List 1:
Bob
Peter
Paul
Jack
Jane

List 2:
Jill
Paul
Peter
Jane
Bob

Our software will color "Jill" green and "Jack" red flagging they are real differences between the two lists. "Bob" and "Peter" will be colored gray meaning they have just been reordered. For this to work, Look for moves and Compare whole lines have to be selected. N.B. This assumes your lists have no duplicates. Standard software such as Microsoft Excel can de-duplicate lists. The desktop text compare software we converted to run as a web application does have the facility to de-duplicate lists. We will publish this at some point.

Select Don’t show any identical paragraphs and just "Jill" and "Jack" will be shown in the results.

Now do you see how switching the level at which text is compared at becomes very useful, how good it is to offer different options and have a diversity of software to choose from?

2) Anything else?

Sometimes you just want to compare two blocks of text. This kind of utility allows you to do that without having to first create two files, launch a desktop utility and navigate to the right directories.

Software delivered by a web-page has the advantage it will work on many different operating systems and it only has to be updated on the server.

3) I am concerned about the security of the text I compare?

You have the option of protecting any communication with encryption so it can’t be intercepted over the Internet. No temporary files are created during the process of text comparison. Everything is done in memory.

4) Are there any limitations?

The software is good at matching whole unchanged lines. You still get good results when comparing at the word level. However when comparing at the character level, sometimes the wrong characters get paired up. The software still reports all the differences, but just the differences don’t correspond to how the text was edited by a human i.e. two letter "b"s will be matched up, but just in the wrong place. It is recommended that you first compare at the level of whole lines or words first. As your text gets longer and there is more context this effect is diminished.

5) Should I pay for this software?

If you think the software has saved you some time, then the answer is that any money you pay us will be appreciated. Our Optional Payment button uses PayPal and you can choose how much to pay us by updating the price entry field. If lots of people use our facility, then the money will pay for the extra bandwidth charges.

Linking to www.diff-text.com will help us.

6) What else do you do?

We are the developers of the software product DiffEngineX, which finds the differences between Microsoft Excel workbooks.

7) Can you place an advertisement for our company on your website?

Finding the differences between text is a common task everyone needs at some point.

We currently use a third party to supply the advertisements on our website, but we are interested in direct deals. Contact us using the contact form on our www.florencesoft.com website.



This is a free service provided by DiffEngineX LLC. Copyright 2008-2016. All rights reserved.
If you like the software and make frequent use of it, you may consider an optional payment to us. Even a few dollars will help us make better tools and pay for the bandwidth.

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