Prompt editing check
Compare prompt changes before you ship them
Paste an original and revised prompt to see exactly how the edit changes token count and estimated input cost.
Change summary
Token change0
Cost change / request$0.000000
Character change0
Paste both versions to compare them. Cost uses $0.15 per 1M input tokens as a clearly labeled OpenAI baseline.
Runs locally in your browser. Your prompts are not uploaded.
FAQ
Prompt diff questions
How does Prompt Diff count tokens?
Both versions are counted locally with the OpenAI o200k_base tokenizer. This is a token count, not a word-splitting estimate.
Does this send my prompt anywhere?
No. The comparison runs in your browser and the text is not uploaded.