Compare Two Prompts — Prompt Diff

Put two prompts side by side and see exactly which words changed, so you know what you actually varied before blaming the model for the difference.

How to use
  1. Paste the first prompt.
  2. Paste the second version beside it.
  3. Read the highlighted differences.
Frequently asked questions
Why diff prompts at all?
Because a prompt that behaves differently usually differs in one clause you have forgotten editing. Seeing the change makes the cause obvious instead of theoretical.
Does whitespace count as a difference?
It is shown, and it can matter. Models are sensitive to formatting, so a lost line break between instruction and context is a real change, not noise.
Is it word level or line level?
Word level, which is what prompts need. Line-level diffing marks a whole paragraph as changed when you swapped one adjective.
Does anything get sent to a model?
No. The comparison is plain text processing in the page, so a prompt containing internal instructions or customer data stays local.
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