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Prompt Diff

See the exact lines added and removed between two prompts, with a separate review of removed constraints and simple conflicting rules.

Use the tool ↓
  1. Keep the original
  2. Inspect the changes
  3. Restore lost constraints
Free · Works in your browserYour pasted text is not sent or saved. This tool stays local-only; refreshing clears it.
1 / Your inputs

Set up your calculation

Example values are filled in where useful. Replace them with your own.

Up to 30,000 characters and 300 lines per version.

Text is compared literally. It is never executed or sent to an LLM.

Calculation inputs stay in this tab unless you explicitly save an eligible snapshot. No account, credit or model call is needed to calculate. Pasted-text tools always stay local.

2 / Your result

Your answer will appear here

Set the inputs, then select “Compare prompt versions”. You will see the result, its assumptions and the next useful step.

  1. Keep the original
  2. Inspect the changes
  3. Restore lost constraints
Understand the answer

Method and worked example

An order-sensitive longest-common-subsequence comparison identifies unchanged, removed and added lines. Removed lines containing constraint words receive a review flag. Explicit always/never and must/must-not pairs are checked for exact action conflicts.

What this result can tell you

Semantic equivalence and subtle contradictions require human review. This is a local text comparison, not an AI judgement about prompt quality.

Use Prompt Doctor for a deeper review →

Method version 3.16.0

Common questions

Does comparing change a saved prompt?

No. Both inputs stay local and no library version is modified. Save an approved revision through your normal prompt workflow.

Are all contradictions detected?

No. Only simple, explicit opposing rules with matching action text are flagged. Review changes to meaning, scope and priority yourself.

References and next checks

Documentation checked 2026-09-05. Provider capabilities can change; use the linked documentation for the exact model or plan.