Prompt Diff Comparator
Compare prompt versions and map expected A/B outputs locally
Version A
Version B
A/B output matrix
| Input | Expected A | Expected B |
|---|---|---|
About this tool
Compare LLM prompt versions, placeholders, metrics, and expected A/B outputs locally. Prompt Diff Comparator runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- Prompt Diff Comparator is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use Prompt Diff Comparator?
Open Prompt Diff Comparator, enter or paste your input, and copy the result. The page works without an account.
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