Zerdly

AI Prompt Version Compare

Compare two versions of an AI prompt side by side to see exactly what changed and track your prompt iterations, free and instant in your browser.

100% FreeRuns in your browserBasic
How to use this calculator

Prompt A

Prompt B

How to use this calculator

  1. Paste version A and version B.
  2. See which is stronger overall.
  3. Use the dimension table to see exactly where they differ.

How it works

Both prompts are scored by the same rule-based engine as the Prompt Score Calculator, then compared overall and across the five dimensions so you can see which change helped.

A higher score means the prompt includes more of the elements of a strong instruction — it's not a guarantee the answer will be better, so test both with your AI tool too.

Common mistakes

  • Comparing prompts that target different tasks — keep the goal fixed and vary only the wording to learn what helps.
  • Judging by one run; AI output varies, so test each version a few times.

Frequently asked questions

Does this use AI or send my prompt anywhere?

No. It runs entirely in your browser using rule-based checks — your prompt is never uploaded or sent to any AI model. Still, avoid pasting passwords, API keys or private data into any tool.

What does this tool do?

It lays two prompt versions side by side and highlights differences in structure (role, task, context, format, constraints) so you can see which is more complete before you use it.

Does it run the prompts through an AI?

No — it compares the text in your browser using rule-based checks. Paste the better version into your own AI tool to actually run it.

Related tools

Explore more in AI Tools.

Cite this tool

Zerdly. (2026). AI Prompt Version Compare. Retrieved from https://www.zerdly.com/tools/ai-prompt-version-compare/

Tip: Enter any known values to calculate the remaining results.

Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.