Drag and drop.

Select the original and the modified file to compare or drag and drop them onto the respective icon in the main window.

Compare texts by characters, words, sentences or lines, and optionally ignore whitespaces or sort the input. Patchword implements the Myers algorithm (on which the diff command is based) to quickly compare texts small and large.

Diff view.

Filter the list of changes, discard any of them, and export the resulting file or a patch of the changes.

Directories.

Compare two directories to see added, removed and modified files, then compare any of the contained files.

If you notice an unwanted change, you can reset individual files in the second directory to the state of the files in the first directory.

If you matched files by pairs sorted by name or by a custom name map, you can rename files in the second directory so that they match the file names in the first directory, without copying the file contents over again.

Copy and paste.

Then compare.

Non-destructive text editing.

Create edit scripts that can be applied non-destructively to any text file, then export the resulting text. Edit scripts iteratively find and replace segments of text, either by exact match or regular expression.

Scripting.

Initiate a comparison from the Shortcuts app.