When comparing CrcCheckCopy vs DiffMerge, the Slant community recommends DiffMerge for most people. In the question“What are the best folder/file compare/diff tools for either OSX, Linux or Windows?” DiffMerge is ranked 8th while CrcCheckCopy is ranked 11th. The most important reason people chose DiffMerge is:
DiffMerge is free of charge to download and use for both commercial and open source projects. There's no license needed. However, people who want to contribute to the project monetarily [can do so](https://www.sourcegear.com/diffmerge/register).
Specs
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Pros
Pro You do not need concurrent access to the folders you are comparing
Files are scanned and their CRC32 hash is stored in a extra file. Using this file you can validate if another folder is identical with this one, even if the other folder is on an offline backup, like your dad's computer.
Pro Completely free
DiffMerge is free of charge to download and use for both commercial and open source projects. There's no license needed. However, people who want to contribute to the project monetarily can do so.
Pro Cross platform
DiffMerge is cross platform and is available for all major operating systems. This means WIndows, Linux and OSX
Pro Folder compare
Pro Three way merges
DiffMerge supports three way merges.
Cons
Con No GUI
No GUI, so if you cannot handle the MacOS terminal or the Windows command prompt, there are other tools to use to compare folders.
Con Startup time can be slow
DiffMerge's startup time can be quite slow sometimes.