Compare Suite can compare both - related and non-related files.
"By keywords" comparison feature highlights common and unique keywords, allowing to compare non-related files.
Word-by-word comparison compares files with a common ancestor.
Folder comparison function allows to compare two folders and files within it.
If you work with plain text, then you can edit compared documents, apply or decline changes.
Finally, you can bring comparison details to simple or advanced structured report.
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