App Store Screenshots Generator

Overview

Build a Next.js page that renders iOS App Store screenshots as advertisements (not UI showcases) and exports them via html-to-image at Apple's required resolutions. Screenshots are the single most important conversion asset on the App Store.

Reads

• brand/creative-kit.md — Brand colors, fonts, logo paths
• brand/voice-profile.md — Copy tone and personality
• brand/positioning.md — Positioning angles for headline direction

On Activation

1. Read brand/creative-kit.md for colors, fonts, and logo.
2. Read brand/voice-profile.md for copy tone — this shapes headline style (playful vs. professional vs. minimal).
3. Read brand/positioning.md for positioning angles — the primary angle informs the hero slide headline direction.
4. If brand/ files don't exist, the skill works at zero context. Step 1 gathers everything needed.

Core Principle

Screenshots are advertisements, not documentation. Every screenshot sells one idea. If you're showing UI, you're doing it wrong — you're selling a feeling, an outcome, or killing a pain point.

Step 1: Ask the User

If brand/ files provided answers (colors, fonts, voice tone), confirm them with the user and skip those questions. Only ask what's genuinely unknown. Do not proceed until you have all answers:

Required

1. App screenshots — "Where are your app screenshots? (PNG files of actual device captures)"
2. App icon — "Where is your app icon PNG?"
3. Brand colors — "What are your brand colors? (accent color, text color, background preference)"
4. Font — "What font does your app use? (or what font do you want for the screenshots?)"
5. Feature list — "List your app's features in priority order. What's the #1 thing your app does?"
6. Number of slides — "How many screenshots do you want? (Apple allows up to 10)"
7. Style direction — "What style do you want? Examples: warm/organic, dark/moody, clean/minimal, bold/colorful, gradient-heavy, flat. Share App Store screenshot references if you have any."

Optional

8. iPad screenshots — "Do you also have iPad screenshots? If so, we'll generate iPad App Store screenshots too (recommended for universal apps)."
9. Component assets — "Do you have any UI element PNGs (cards, widgets, etc.) you want as floating decorations? If not, that's fine — we'll skip them."
10. Additional instructions — "Any specific requirements, constraints, or preferences?"

Derived from answers (do NOT ask — decide yourself)

Based on the user's style direction, brand colors, and app aesthetic, decide:

• Background style: gradient direction, colors, whether light or dark base
• Decorative elements: blobs, glows, geometric shapes, or none — match the style
• Dark vs light slides: how many of each, which features suit dark treatment
• Typography treatment: weight, tracking, line height — match the brand personality
• Color palette: derive text colors, secondary colors, shadow tints from the brand colors

IMPORTANT: If the user gives additional instructions at any point during the process, follow them. User instructions always override skill defaults.

Step 2: Set Up the Project

Detect Package Manager

Check what's available, use this priority: bun > pnpm > yarn > npm

# Check in order
which bun && echo "use bun" || which pnpm && echo "use pnpm" || which yarn && echo "use yarn" || echo "use npm"

Scaffold (if no existing Next.js project)

# With bun:
bunx create-next-app@latest . --typescript --tailwind --app --src-dir --no-eslint --import-alias "@/*"
bun add html-to-image

# With pnpm:
pnpx create-next-app@latest . --typescript --tailwind --app --src-dir --no-eslint --import-alias "@/*"
pnpm add html-to-image

# With yarn:
yarn create next-app . --typescript --tailwind --app --src-dir --no-eslint --import-alias "@/*"
yarn add html-to-image

# With npm:
npx create-next-app@latest . --typescript --tailwind --app --src-dir --no-eslint --import-alias "@/*"
npm install html-to-image

Copy the Phone Mockup

The skill includes a pre-measured iPhone mockup at mockup.png (co-located with this SKILL.md). Copy it to the project's public/ directory. The mockup file is in the same directory as this skill file. No iPad mockup is needed — the iPad frame is CSS-only.

File Structure

project/
├── public/
│   ├── mockup.png              # iPhone frame (included with skill)
│   ├── app-icon.png            # User's app icon
│   ├── screenshots/            # iPhone app screenshots
│   │   ├── home.png
│   │   ├── feature-1.png
│   │   └── ...
│   └── screenshots-ipad/       # iPad app screenshots (optional)
│       ├── home.png
│       ├── feature-1.png
│       └── ...
├── src/app/
│   ├── layout.tsx              # Font setup
│   └── page.tsx                # The screenshot generator (single file)
└── package.json

Note: No iPad mockup PNG is needed — the iPad frame is rendered with CSS (see iPad Mockup Component below).

The entire generator is a single page.tsx file. No routing, no extra layouts, no API routes.

Font Setup

// src/app/layout.tsx
import { YourFont } from "next/font/google"; // Use whatever font the user specified
const font = YourFont({ subsets: ["latin"] });

export default function Layout({ children }: { children: React.ReactNode }) {
  return <html><body className={font.className}>{children}</body></html>;
}

Step 3: Plan the Slides

Screenshot Framework (Narrative Arc)

Adapt this framework to the user's requested slide count. Not all slots are required — pick what fits:

Rules:

• Each slide sells ONE idea. Never two features on one slide.
• Vary layouts across slides — never repeat the same template structure.
• Include 1-2 contrast slides (inverted bg) for visual rhythm.

Step 4: Write Copy FIRST

Get all headlines approved before building layouts. Bad copy ruins good design.

The Iron Rules

1. One idea per headline. Never join two things with "and."
2. Short, common words. 1-2 syllables. No jargon unless it's domain-specific.
3. 3-5 words per line. Must be readable at thumbnail size in the App Store.
4. Line breaks are intentional. Control where lines break with <br />.

Three Approaches (pick one per slide)

What NEVER Works

• Feature lists as headlines: "Log every item with tags, categories, and notes"
• Two ideas joined by "and": "Track X and never miss Y"
• Compound clauses: "Save and customize X for every Y you own"
• Vague aspirational: "Every item, tracked"
• Marketing buzzwords: "AI-powered tips" (unless it's actually AI)

Copy Process

1. Write 3 options per slide using the three approaches
2. Read each at arm's length — if you can't parse it in 1 second, it's too complex
3. Check: does each line have 3-5 words? If not, adjust line breaks
4. Present options to the user with reasoning for each

Reference Apps for Copy Style

• Raycast — specific, descriptive, one conc