Prompt Diff - Free Online Tool | PivaBox

Compare two prompt versions side-by-side with word/character/line diff — track iterations and see what changed

How to Use Prompt Diff

1. Enter two prompt versions in Prompt A and Prompt B text areas
2. Choose a diff mode — Word (compare by word), Character (compare by character), or Line (compare by line)
3. Click Compare to see the visual diff with green additions, red deletions, and similarity percentage. Use the iteration history to track multiple versions

Frequently Asked Questions

Is Prompt Diff free?

Yes, PivaBox Prompt Diff is completely free. All diff computation runs locally in your browser using a longest common subsequence (LCS) algorithm.

How does the diff algorithm work?

The tool tokenizes text based on the selected mode (words, characters, or lines), then computes the longest common subsequence to identify matching portions. Additions are shown in green, deletions in red, and matching text in the default color.

Can I track multiple prompt iterations?

Yes. Each time you type in Prompt B, the content is saved to the Iteration History panel. Click any previous version to load it into Prompt B for side-by-side comparison with the current Prompt A.