Free software to Compare the appearance difference of two PDF

yesterday(Nov 17, 2010), I received a requirement email from my Batch ReaderEnable customer,

I contacted you for a advise on PDF compare. we do have a requirement to Comparing the version of PDF files, when we are using Acrobat inbuilt compare options, it’s comparing only the text and it’ll miss out the formatting elements (bold, italic, superscript, subscript, bolditalic etc), it caused lot off manual work and time consuming, do you have any idea or software for this, if so please inform us, we will discuss the cost.

and I occurred to DiffPDF, a Free open source and cross-platform software that can compare two PDF in text and appearance mode. it is developed in Qt and bases on Poppler-qt.

P.S.
I has recommend it to PortableApps.com, and hope it can be accepted.

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