Offline Diff Checker

Privacy friendly macOS app for developers

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Text Diff Checker

Compare texts for differences without online tools. allows you to quickly compare the difference between text strings without any internet connection. It supports visual highlighting the diff, renders HTML, or the patch format of the diff. Text Diff Checker macOS app
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Quickly compare two text strings

You can start to compares text strings from anywhere in your macOS (terminal, in email, web browser,…). Activate the app by:


Enter your first string in the left input textbox and the second string to compare in the right input textbox. Clicking the “Swap Inputs” button allows you to quickly swap the two strings.


The tool will render the diff and highlight it visually in the bottom panel. You can choose to view the diff with the following format:

You can navigate through the diffs by clicking the arrow buttons near the output text view. The number between arrows is the number of diff sections found in the output.


You can choose to compare the text strings using character-based, word-based, or line-based. Select the option you want in the “Diff mode” section.