How are the rubric scores calculated?

Scores are calculated locally using deterministic heuristics that evaluate specificity, structure, constraint clarity, and robustness.

Do I need an API key to use this tool?

No, the default generation runs locally and deterministically. An API key is only required if you enable the 'Generate with AI' option.

What dimensions can I vary?

You can vary the persona (who speaks), tone/style, output format, and specific constraints of the prompt.

What does the diff view show?

The diff view highlights word-level additions and deletions between your baseline prompt and each generated variant.

Can I control how creative the AI variants are?

Yes, adjusting the temperature slider pushes the AI-generated variants toward more concrete and specific phrasing.

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AI Prompt A/B Variant Generator

Generate controlled A/B variants of a prompt across the persona, tone/style, output format, and constraints dimensions, then compare them side by side with a heuristic rubric score and a word-level diff against the baseline. A reproducible way to test how a prompt behaves under different framings before picking one for production.

Details

What this tool helps you do

A controlled prompt-variant generator for prompt engineers and PMs:

Base prompt — the prompt you want to stress-test.
Vary dimensions — pick which axes to vary: persona (who speaks), tone/style, output format, and constraints. Each axis has a small library of values.
Number of variants — how many to generate (A is always the baseline; B, C, … each vary a distinct combination of axes).
Render mode — side-by-side cards (with per-axis rubric bars), a diff view (word-level diff of each variant against baseline A), or a full comparison table.
Rubric — each variant is scored 0–100 on specificity, structure, constraint clarity, and robustness using deterministic heuristics, so variants are comparable and reproducible.

Unlike a single-point "rewrite", this explores the variation space so you can see how the same intent changes across framings. Generation is deterministic and runs locally (no model calls), so results are reproducible for A/B comparison. Toggle "Generate with AI" to optionally refine variants with a live model (needs an API key).

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Summarize a doc: 4 variants across persona/tone/format

A summarization prompt varied across persona, tone, and output format to compare brevity vs. structure.

<div class="pv-wrap"><div class="pv-grid"><div class="pv-card">…A — Baseline…</div>…</div></div>

Diff view: what changed vs baseline

Same prompt with the diff render mode, showing a word-level diff of each variant against baseline A.

Inputs

Set the required fields, then run the tool.

6 options

ContentPaste or type the main input values.1

Base prompttextareaRequiredThe prompt whose variants you want to generate. Its task intent is preserved across variants.

SettingsAdjust formats, ranges, numbers, and modes.4

Vary dimensionsselectOptionalWhich axes to vary. Defaults to persona, tone, and format.Number of variantsnumberRequiredHow many variants to generate, including baseline A.Render modeselectOptionalTemperature (creativity 0–1)numberOptionalHigher values push variants toward more concrete, specific phrasing.

TogglesEnable or disable optional behavior.1

Generate with AIcheckboxOptionalEnabled when checkedWhen on, rewrite each variant (except baseline A) with DeepSeek (deepseek/deepseek-v4-flash) for production-ready prose. Off = deterministic heuristic output. Needs an API key.

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Examples that match this tool

Continue with connected tools and hubs

Base Prompt: 'Summarize the attached research paper for a busy product manager. Focus on what changed and why it matters.' | Dimensions: ['persona', 'tone', 'format'] | Count: 4 | Render Mode: 'cards'

AI Prompt A/B Variant Generator

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Optimizing a Research Summarization Prompt

2. Comparing Technical Explanation Prompts with Diff View

FAQ

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