Compare two versions of an AI prompt and see added, removed, and unchanged words plus the estimated token-count change. Review system-prompt edits before replacing a working version.
How to use the AI Prompt Diff Checker
Keep the working prompt in the left box and the candidate revision in the right. Review removed constraints carefully, then copy the report into your change log or evaluation notes.
Frequently Asked Questions
How do I compare two AI prompts?
Paste the current prompt as version A and the revision as version B, then inspect additions, removals, and token change.
Why use a prompt diff instead of a text diff?
This report emphasizes word-level instruction changes and approximate token impact.
Does the checker evaluate which prompt is better?
No. It shows changes objectively; quality still requires testing with representative inputs.
Can I compare system prompts?
Yes. It works with system instructions, reusable templates, and ordinary user prompts.
Are prompts sent to a server?
No. Comparison runs locally in your browser.