---
name: ad-creative-variant-generator
description: Generate headline and body variants respecting platform character limits and style rules, then rank them on a clarity and hook rubric.
title: Ad Creative Variant Generator
category: design-media
difficulty: intermediate
author: admin
icon: 📢
input: structured-data
output: structured-json
phase: enhance
domain: design
tags: ad-copy-generation,variant-ranking,platform-constraints,copywriting,a-b-testing,character-limits,prompt-engineering,rubric-scoring,multi-axis-evaluation,content-optimization
best_for:
  - e-commerce and SaaS ad campaigns
  - multi-platform marketing workflows
  - rapid A/B test candidate generation
  - constraint-aware copywriting at scale
---

## Description

Input: a product description + a target platform (Google Ads, Meta, LinkedIn, X). Output: 8-12 ad variants respecting that platform's character limits and format rules, each scored on three axes (hook strength, clarity, CTA specificity) so you have a short list to A/B test.

## Why it works

Ad copy fails most often from platform-format violations (too long, missing second headline) or from generic CTAs. Generating variants under strict length constraints up front — instead of trimming after — produces copy that fits the format natively, and scoring on fixed axes prevents 'I like this one' picks that don't survive A/B.

## How it works

1. Load a platform spec (char limits per field, banned phrases, required elements). 2. Generate N candidates with a prompt that includes the platform spec as hard constraints. 3. Filter candidates that violate the spec. 4. Score surviving candidates on the three axes via a separate LLM call with a rubric and example scores. 5. Return the top K by sum of axes, plus a diversity check that ensures the picks aren't near-duplicates.