App screenshot studio

Skill nicolocurioni96/withnico-skills/.skills/app-screenshot-studio

Open source Claude Code agent skills for iOS developers and content creators on Mac

Install

npx -y skills add nicolocurioni96/withnico-skills --skill app-screenshot-studio

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Autonomously generate, design, and organize App Store screenshots for iOS and iPadOS apps. Use this skill whenever a developer asks to create App Store screenshots, generate screenshot assets, design screenshot templates, capture simulator screens, produce localized screenshots, or organize screenshots by device size. Triggers on phrases like "create my App Store screenshots", "generate screenshots for my app", "make screenshot assets", "design screenshot templates", "capture simulator screenshots", "build my App Store creatives". This skill handles the FULL pipeline end-to-end: capturing raw UI from the Xcode Simulator → generating styled composites with text overlays → organizing output into ASC-ready folder structure. Always use this skill when any part of the App Store screenshot workflow is mentioned.

SKILL.md

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Shotkit

End-to-end App Store screenshot pipeline for indie iOS developers. From raw Simulator capture to upload-ready assets organized by device, locale, and template style.

What This Skill Does

Stage 1 — Capture (optional): Takes raw UI screenshots from the Xcode Simulator using xcrun simctl.

Stage 2 — Generate Copy: Produces locale-aware headlines + sublines for each screenshot frame.

Stage 3 — Composite: Renders styled screenshot images using Pillow — background, device mockup area, app UI screenshot, and text overlay.

Stage 4 — Organize: Outputs a folder structure compatible with asc CLI and App Store Connect upload.

Workflow

Step 1 — Collect Inputs

Ask the developer for the following (or infer from context if already provided):

Required:

App name
Core features to highlight (3–8 bullet points)
Target audience (one sentence)
Primary language (default: English)
Additional locales (optional, e.g. Italian, German, Japanese)

Screenshot source (choose one):

A) Auto-capture from booted Simulator → ask for app Bundle ID
B) Existing screenshots folder → ask for path to folder of PNG/JPG files
C) No UI screenshots yet → generate placeholder-based composites with colored UI mockups

Template style (choose one, or generate previews for all):

minimal — white/light background, small device frame, centered text, clean typography
bold — full-bleed gradient background, large text, high contrast, punchy
dark — dark/black background, device glow effect, premium feel
editorial — magazine-style layout, diagonal composition, text beside device
flat — no device frame, full-bleed app UI with text overlay bar at top or bottom

Device targets (default: iPhone 6.9" + iPad 13"):

iPhone 6.9" — 1320 × 2868 px (mandatory as of 2025)
iPhone 6.7" — 1290 × 2796 px (legacy, still widely used)
iPhone 6.5" — 1242 × 2688 px
iPad 13" — 2064 × 2752 px (mandatory if app supports iPad)
iPad 12.9" — 2048 × 2732 px

Read references/device_specs.md for the full device dimensions table.

Step 2 — Install Dependencies

cat > "$REPO/skills/shotkit/scripts/install_deps.sh" << 'EOF'
#!/bin/bash
set -e
echo "📦 Installing shotkit dependencies..."
if ! command -v python3 &>/dev/null; then
  echo "❌ Python 3 not found. Install via: brew install python3"
  exit 1
fi
echo "✅ Python $(python3 --version) found"
pip3 install Pillow --quiet --break-system-packages 2>/dev/null \
  || pip3 install Pillow --quiet 2>/dev/null \
  || { echo "❌ Pillow install failed. Try: pip3 install Pillow"; exit 1; }
echo "✅ Pillow installed"
if command -v xcrun &>/dev/null; then
  echo "✅ xcrun found (Xcode present)"
else
  echo "⚠️  xcrun not found. Simulator capture will not work."
fi
echo ""
echo "✅ Dependencies ready."