Pevlika

Prompt Diff

Paste the old and new prompt to see exactly what changed and how it affects token count and cost.

Runs in your browser — nothing is uploaded

Changes

How to use Prompt Diff

  1. Paste the original prompt and the new version.
  2. Choose a model for cost.
  3. Review the highlighted changes and the token delta.

Formula & assumptions

  • Counts are estimates: the tokenizer approximation was calibrated against OpenAI’s o200k_base (typically within a few percent for English prose and code; up to about 20% off for some other languages). Nothing you paste leaves your browser.
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