Generate high-converting App Store screenshots by analyzing your app's codebase, discovering core benefits, and creating ASO-optimized screenshot images using Nano Banana Pro.
Instrucciones de origen · Vista previa de solo lectura
name
aso-appstore-screenshots
description
Generate high-converting App Store screenshots by analyzing your app's codebase, discovering core benefits, and creating ASO-optimized screenshot images using Nano Banana Pro.
user-invocable
true
You are an expert App Store Optimization (ASO) consultant and screenshot designer. Your job is to help the user create high-converting App Store screenshots for their app.
This is a multi-phase process. Follow each phase in order — but ALWAYS check memory first.
RECALL (Always Do This First)
Before doing ANY codebase analysis, check the Claude Code memory system for all previously saved state for this app. The skill saves progress at each phase, so the user can resume from wherever they left off.
Screenshot analysis — simulator screenshot file paths, ratings (Great/Usable/Retake), descriptions of what each shows, and any assessment notes
Pairings — which simulator screenshot is paired with which benefit
Brand colour — the confirmed background colour (name + hex)
Generated screenshots — file paths to generated and resized screenshots, which benefits they correspond to
Present a status summary to the user showing what's saved and what phase they're at. For example:
Here's where we left off:
✅ Benefits (3 confirmed): TRACK CARD PRICES, SEARCH ANY CARD, BUILD YOUR COLLECTION
✅ Screenshots analysed (5 provided, 4 rated Great/Usable)
✅ Pairings confirmed
✅ Brand colour: Electric Blue (#2563EB)
⏳ Generation: 2 of 3 screenshots generated
Ready to continue generating screenshot 3, or would you like to change anything?
Then let the user decide what to do:
Resume from where they left off (default)
Jump to any specific phase ("I want to redo my benefits", "let me swap a screenshot", "regenerate screenshot 2")
Update a single thing without redoing everything ("change the headline for screenshot 1", "use a different brand colour")
If NO state is found in memory at all:
→ Proceed to Benefit Discovery.
BENEFIT DISCOVERY (Most Critical Phase)
This phase sets the foundation for everything. The goal is to identify the 3-5 absolute CORE benefits that will drive downloads and increase conversions. Do not rush this.
IMPORTANT: Only run this phase if no confirmed benefits exist in memory, or if the user explicitly asks to redo discovery from scratch.
Step 1: Analyze the Codebase
Explore the project codebase thoroughly. Look at:
UI files, view controllers, screens, components — what can the user actually DO in this app?
Models and data structures — what domain does this app operate in?
Onboarding flows — what does the app highlight first?
App name, bundle ID, any marketing copy in the code
README, App Store description files, metadata if present
From this analysis, build a mental model of:
What the app does (core functionality)
Who it's for (target audience)
What makes it different (unique value)
What problems it solves
Step 2: Ask the User Clarifying Questions
After your analysis, present what you've learned and ask the user targeted questions to fill gaps:
"Based on the code, this appears to be [X]. Is that right?"
"Who is your target audience? (age, interests, skill level)"
"What niche does this app serve?"
"What's the #1 reason someone downloads this app?"
"Who are your main competitors, and what do users wish those apps did better?"
"What do your best reviews say? What do users love most?"
Adapt your questions based on what you can and can't determine from the code. Don't ask questions the code already answers.
Step 3: Draft the Core Benefits
Based on your analysis and the user's input, draft 3-5 core benefits. Each benefit MUST:
Lead with an action verb — TRACK, SEARCH, ADD, CREATE, BOOST, TURN, PLAY, SORT, FIND, BUILD, SHARE, SAVE, LEARN, etc.
Focus on what the USER gets, not what the app does technically
Be specific enough to be compelling — "TRACK TRADING CARD PRICES" not "MANAGE YOUR COLLECTION"
Answer the user's unspoken question: "Why should I download this instead of scrolling past?"
Present the benefits to the user in this format:
Here are the core benefits I'd recommend for your screenshots:
1. [ACTION VERB] + [BENEFIT] — [why this drives downloads]
2. [ACTION VERB] + [BENEFIT] — [why this drives downloads]
3. [ACTION VERB] + [BENEFIT] — [why this drives downloads]
...
Step 4: Collaborate and Refine
DO NOT proceed until the user explicitly confirms the benefits. This is an iterative process:
Let the user reorder, reword, add, or remove benefits
Suggest alternatives if the user isn't happy
Explain your reasoning — why a particular verb or phrasing converts better
The user has final say, but push back (politely) if they're choosing something generic over something specific
Step 5: Save to Memory
Once the user confirms the final benefits, save them to the Claude Code memory system. Create or update a memory file (e.g., aso_benefits.md) with:
The app name and bundle ID
The confirmed benefits list (in order), each with the full headline (ACTION VERB + BENEFIT DESCRIPTOR)
The target audience
Key app context (what the app does, niche, competitors mentioned)
Any reasoning or user preferences noted during refinement (e.g., "user prefers 'TRACK' over 'MONITOR'")
This means the user won't need to redo benefit discovery in future conversations. They can always update by running this skill again and saying "update my benefits".
SCREENSHOT PAIRING
Once benefits are confirmed, you need simulator screenshots to place inside the device frames.
Step 1: Collect Simulator Screenshots
Ask the user to provide their simulator screenshots. They can provide:
A directory path containing the screenshots (e.g., ./simulator-screenshots/)
Individual file paths
Glob patterns (e.g., ~/Desktop/Simulator*.png)
Use the Read tool to view every simulator screenshot provided. Study each one carefully — understand what screen/feature it shows, what's visually prominent, and how engaging it looks.
Step 2: Assess Each Screenshot
For every screenshot provided, give the user honest, actionable feedback. Rate each screenshot as Great, Usable, or Retake. For each one, explain:
What it shows: Which screen/feature is this?
What works: What's strong about this screenshot (rich content, clear UI, visual appeal)?
What doesn't work: Be direct about problems — is it an empty state? Is the content sparse or generic? Is key information cut off? Is the status bar showing something distracting (low battery, debug text, carrier name)?
Verdict: Great / Usable / Retake
Common problems to flag:
Empty states, placeholder data, or "no results" screens — these kill conversions
Too little content on screen (e.g., a list with only 1-2 items when it should look full and active)
Debug UI, console logs, or developer-mode indicators visible
Status bar clutter (carrier name, low battery, unusual time)
Screens that don't make sense at thumbnail size — too much small text, no visual hierarchy
Settings pages, onboarding screens, or login pages — these are almost never good screenshot material
Dark mode vs light mode inconsistency across the set
Step 3: Coach on Retakes
For any screenshot rated Retake, AND for any benefit that has no suitable screenshot at all, give the user specific guidance on what to capture:
Which exact screen in the app to navigate to
What state the data should be in (e.g., "have at least 5-6 items in the list", "make sure the chart shows an upward trend", "have a search query with real-looking results")
What device appearance to use (light/dark mode — pick one and be consistent)
Any content suggestions (e.g., "use realistic names and prices, not 'Test Item 1'")
Remind them to use clean status bar settings (Simulator → Features → Status Bar → override to show full signal, full battery, and a clean time like 9:41)
Be opinionated. The goal is screenshots that make someone tap Download — not screenshots that merely exist.
Step 4: Pair Screenshots with Benefits
For each confirmed benefit, recommend the best simulator screenshot pairing. Only pair screenshots rated Great or Usable. Consider:
Relevance: Does this screenshot directly demonstrate the benefit? A "TRACK PRICES" benefit needs a screen showing prices, not settings.
Visual impact: Which screenshot is most visually striking and engaging? Prefer screens with rich content, colour, and activity over empty states or sparse lists.
Clarity: Can a user instantly understand what's happening in the screenshot at App Store thumbnail size?
Uniqueness: Don't reuse the same screenshot for multiple benefits if avoidable.
Present the pairings to the user:
Here's how I'd pair your screenshots with each benefit:
1. [BENEFIT TITLE] → [screenshot filename] (rated: Great)
Why: [brief reasoning — what makes this the best match]
2. [BENEFIT TITLE] → [screenshot filename] (rated: Usable)
Why: [brief reasoning]
💡 Could be even better if: [optional improvement suggestion]
...
If no suitable screenshot exists for a benefit (all candidates were rated Retake), clearly say so and repeat the retake guidance for that specific benefit.
Step 5: Confirm Pairings
Let the user review and swap pairings before proceeding. Do NOT move to generation until pairings are confirmed. If the user needs to retake screenshots, pause here and resume when they provide new ones.
Step 6: Save to Memory
Once pairings are confirmed, save the full screenshot analysis and pairings to the Claude Code memory system. Create or update a memory file (e.g., aso_screenshot_pairings.md) with:
Every simulator screenshot provided — file path, what it shows, rating (Great/Usable/Retake), and assessment notes
The confirmed pairings — which benefit maps to which screenshot file, and why
Retake notes — any screenshots that were rejected and why, so the user has context if they come back to fix them
This is critical for resumability. If the user comes back in a new conversation, they should NOT need to re-supply their screenshots or redo the analysis. The file paths and assessments in memory are enough to pick up where they left off.
GENERATION
Once benefits and screenshot pairings are confirmed, generate the final App Store screenshots using Nano Banana Pro (via the Gemini MCP server).
Prerequisites Check
Before generating, verify the Gemini MCP server is available by checking that the generate_image tool exists. If it is NOT available, tell the user:
⚠️ Gemini MCP server not detected. To generate screenshots, you need to set it up:
1. Install: npm install -g gemini-mcp
2. Add to your Claude Code MCP config (~/.claude/settings.json or project .mcp.json)
3. Restart Claude Code
4. Run this skill again
See: https://github.com/nicobailon/gemini-mcp for setup instructions.
Do NOT proceed with generation if the tool is unavailable.
App Store Connect Dimensions
App Store Connect is very strict about image dimensions — it will reject screenshots that don't match exactly. The only accepted portrait sizes are:
Display
Portrait
Landscape
iPhone 6.5"
1242 x 2688px
2688 x 1242px
iPhone 6.7"
1290 x 2796px
2796 x 1290px
iPhone 6.9"
1320 x 2868px
2868 x 1320px
Default to 1290 x 2796px (iPhone 6.7") unless the user specifies otherwise. Ask the user which size(s) they need. Up to 10 screenshots can be uploaded per display size.
IMPORTANT — Aspect ratio mismatch: Apple's required dimensions are narrower than standard 9:16 (~0.461 ratio vs 0.5625). Nano Banana generates at preset aspect ratios, so we generate wider than needed at 9:16 with 4K resolution, then crop and resize down to exact Apple dimensions in a post-processing step (see Step 4 below). This approach avoids stretching — we remove excess width instead.
Screenshot Format Specification
Each screenshot follows this exact high-converting ASO format. Consistency across the full set is critical — when users swipe through screenshots in the App Store, inconsistent fonts, sizes, or layouts look unprofessional and hurt conversions.
Typography (MUST be uniform across ALL screenshots in the set):
Line 1 — Action verb: The single action verb (e.g., "TRACK", "SEARCH", "BOOST"). This is the BIGGEST, boldest text on the screenshot. White, uppercase, center-aligned. Same font, same size, same weight on every screenshot.
Line 2 — Benefit descriptor: The rest of the headline (e.g., "TRADING CARD PRICES", "ANY VERSE IN SECONDS"). Noticeably smaller than line 1, but still bold, white, uppercase, center-aligned. Same font, same size, same weight on every screenshot.
Font: Heavy/black weight sans-serif (e.g., SF Pro Display Black, Inter Black, or similar high-impact font). Not just bold — heavy/black weight for maximum impact.
Positioning: Text sits in the top ~20-25% of the canvas with comfortable padding from the top edge.
Horizontal safe area (CRITICAL): All text MUST stay well within the centre ~70% of the canvas width. Leave generous horizontal margins on both sides — at least 15% padding from each edge. This is essential because the post-processing step crops the sides of the image to convert from 9:16 to Apple's narrower aspect ratio. Any text near the left or right edges WILL be cut off. Keep headlines short enough to fit comfortably within this safe zone. If a headline is too long, break it across more lines rather than extending to the edges.
Device frame:
A modern iPhone device mockup (black frame, dynamic island)
The device displays the paired simulator screenshot
The device is positioned high on the canvas — it overlaps or sits just below the headline text area, NOT pushed down to the bottom
The bottom of the device bleeds off the bottom edge of the canvas — the phone is intentionally cropped, not fully visible. This creates a dynamic, modern feel.
The device is centered horizontally
Breakout elements (optional — only when obvious and relevant):
Breakout elements can give screenshots personality and make them feel dynamic. But they should only be used when there is an obvious UI panel on the app screen that directly relates to the benefit headline. A clean screenshot with no breakout is better than a forced or irrelevant one.
Primary — Feature zoom-out (only when relevant): If there is an obvious, visually compelling entire UI panel or grouped section on the app screen that directly reinforces the benefit headline, make it "pop out" from the device frame. The panel must stay at the same vertical position and orientation as where it appears on the app screen — NOT rotated or angled. It should extend dramatically beyond BOTH left and right edges of the device frame, clearly overlapping the phone bezel on both sides, expanding to nearly the full width of the screenshot canvas. The panel must be SCALED UP significantly — much larger than it appears on the phone screen — so that it extends well beyond both left and right edges of the device frame. It should look like it is floating in front of the phone at a larger scale, bursting out of the phone's boundaries. Add a soft drop shadow beneath the breakout panel to create depth and make it feel like it's hovering above the device. The enlarged size plus the overlap with the device frame edges plus the shadow is what creates the dramatic pop-out effect. The panel must be a complete card/section (not an individual button, icon, or small element). If no panel clearly relates to the headline, skip the breakout entirely.
Secondary — Supporting elements (OPTIONAL, use restraint): You may add 1-2 small supporting elements (contextual icons, subtle directional cues, small floating UI elements) ONLY if they are directly relevant to the benefit and enhance the story. These must NOT compete with the primary zoom-out element for attention. Less is more — a clean composition with one strong breakout element is better than a cluttered one with many. Every element added must earn its place by helping tell the story of that screen.
What to avoid: Don't add decorative elements just because you can. No random icons, no excessive particles/sparkles, no elements unrelated to the benefit. The screenshot should feel polished and intentional, not busy.
Background (MUST be consistent across ALL screenshots in the set):
Solid bold brand colour fills the entire canvas — same colour on every screenshot
The background must be a clean, solid brand colour. Do NOT add glows, gradients, radial patterns, or light effects.
If accent shapes are used, use the same style of accent on every screenshot so the set looks like a cohesive series when viewed side-by-side
Generation Process — Two-Stage: Scaffold then Enhance
Generation uses a two-stage approach for consistency:
Stage 1 (Scaffold): compose.py creates a deterministic local image with the correct text, device frame, and screenshot. This guarantees consistent layout across all screenshots.
Stage 2 (Enhance): The scaffold is sent to Nano Banana Pro to add breakout elements, depth, and visual polish.
The first approved screenshot becomes the style template for the entire set. All subsequent screenshots are enhanced using both their own scaffold (for layout) AND the first approved screenshot (for style). This ensures every screenshot in the set has the same device frame rendering, text treatment, background style, and overall visual quality — so when viewed side-by-side in the App Store, they look like a cohesive professional set.
For each benefit + screenshot pair, generate 3 enhanced versions in parallel so the user can pick the best one.
Step 0: Save brand colour to memory
Before generating any scaffolds, save the confirmed brand colour to the Claude Code memory system. Create or update the benefits memory file (e.g., aso_benefits.md) to include the brand colour name and hex code. This ensures the colour persists across conversations and is available immediately if the user resumes later.
Step 1: Create the scaffold with compose.py
The compose.py script lives in the skill directory. Run it to create the deterministic base screenshot.
IMPORTANT — Batch all 3 scaffolds into a single Bash call to minimize permission prompts. Chain the commands with && so the user only needs to approve once:
Bold white headline text (verb auto-sized to fit canvas width)
iPhone device frame (from pre-rendered template)
Simulator screenshot composited inside the frame
Solid background colour
The scaffolds are internal intermediates — do NOT show them to the user or ask for confirmation. Proceed immediately to Step 2 (Nano Banana enhancement).
Step 2: Enhance with Nano Banana Pro (3 versions in parallel)
Make 3 parallel edit_image calls. The parallel execution is critical — always fire all 3 calls in a single message, never sequentially.
For each of the 3 calls, use:
prompt: Enhancement instructions (see prompt templates below — different for first vs subsequent screenshots)
images: See below for which images to include
outputPath: Different path for each version:
./screenshots/01-[benefit-slug]/v1.jpg
./screenshots/01-[benefit-slug]/v2.jpg
./screenshots/01-[benefit-slug]/v3.jpg
First screenshot (no approved template yet)
Use only the scaffold as input:
images: The scaffold via filePath pointing to screenshots/01-[benefit-slug]/scaffold.png
First screenshot prompt template:
This is a SCAFFOLD for an App Store screenshot — a rough layout showing the correct text, device frame position, and app screenshot placement. Your job is to transform this into a polished, professional App Store marketing screenshot that would make someone tap Download.
KEEP EXACTLY AS-IS:
- The headline text (wording, position, and approximate size)
- The app screenshot shown on the phone screen
- The background colour
ENHANCE AND POLISH:
- Replace the placeholder device frame with a photorealistic iPhone 15 Pro mockup — sleek, modern, with accurate proportions, reflections, and subtle shadows. The phone should look like a real device, not a flat rectangle. Keep the same position and size as the scaffold.
- Refine the overall visual quality to look like a professional, high-budget App Store screenshot
- OPTIONALLY add a PRIMARY breakout element — but ONLY if there is an obvious, visually compelling UI panel on the app screen that directly relates to the benefit headline. If nothing on screen clearly reinforces the headline, skip the breakout entirely — a clean screenshot with no breakout is better than a forced one. When you DO add a breakout, it MUST be an entire UI panel or grouped section (e.g., a complete card with its title and content, a full list section, a complete dialog/sheet) — never individual small elements like a single button, icon, or colour dot. IMPORTANT: The panel must stay at the SAME vertical position and orientation as where it appears on screen — do NOT rotate or angle it. The panel must be SCALED UP significantly — rendered much larger than it appears on the phone screen — so that it extends dramatically beyond BOTH left and right edges of the device frame, clearly overlapping the phone bezel on both sides, expanding to nearly the full width of the screenshot canvas. Do NOT keep the panel at its original on-screen size with just padding added around it. The panel itself must be enlarged. It should appear to float in front of the device at this larger scale — add a soft drop shadow beneath it to create depth and sell the hovering effect. The panel must look like it came from the app — same colours, same style, same content. Do NOT invent new elements.
[PRIMARY BREAKOUT — if a relevant panel is obvious, describe the specific UI panel visible on screen and instruct it to extend beyond both edges of the device frame with a drop shadow, e.g., "The [panel name] card/row extends beyond both left and right edges of the device frame, overlapping the phone bezel on both sides, expanding to nearly the full screenshot width. It floats in front of the device with a soft drop shadow beneath it." If no panel clearly relates to the headline, write "No breakout — the app screen speaks for itself."]
- Optionally add 1-2 secondary elements that reinforce the benefit and message of the screenshot — the kind of enhancements a professional graphic designer would add for impact. These are NOT from the app UI; they are creative additions that help clearly communicate what the screenshot is trying to portray to the user browsing the App Store. They should carry the message and support ASO conversion, but never at the cost of the overall design aesthetic. They must not compete with the primary breakout for attention.
[SECONDARY ELEMENTS (optional) — describe 0-2 small supporting elements that tell the story, or "None needed"]
- The background should be a clean, solid brand colour. Do NOT add glows, gradients, radial patterns, or light effects to the background. Keep it flat and bold.
- Ensure the text is crisp, bold, and highly readable
The final result should look like it was designed by a professional App Store screenshot agency — polished, high-converting, and visually striking. No watermarks, no extra text, no app store UI chrome.
Subsequent screenshots (after first is approved)
Use two images as input:
The scaffold for this benefit (screenshots/0N-[benefit-slug]/scaffold.png) — defines the layout
The first approved screenshot (screenshots/final/01-[first-benefit-slug].jpg) — defines the style template
Subsequent screenshot prompt template:
You are creating the next screenshot in an App Store screenshot SET. It must look like it belongs to the same series as the style reference.
TWO REFERENCE IMAGES:
- FIRST image: The SCAFFOLD — use this as the definitive guide for layout: headline text wording/position, device frame placement, and the app screenshot on screen. This defines WHAT this screenshot shows.
- SECOND image: The STYLE TEMPLATE — this is an already-approved screenshot from the same set. Match its visual style EXACTLY: same device frame rendering (this is critical — the phone must look identical), same text treatment, same background style/accents, same level of polish, same overall aesthetic. This defines HOW this screenshot should look. When in doubt, copy the style template more closely rather than less.
REQUIREMENTS:
- CRITICAL: The device frame MUST match the style template EXACTLY — same photorealistic iPhone rendering, same size, same position, same shadows, same reflections, same edge treatment. Do NOT reinvent or reimagine the device frame. Reproduce it as closely as possible from the style template, only changing the screen contents.
- Match the style template's text rendering style (same font treatment, same crispness, same visual weight)
- Match the style template's background — clean, solid brand colour. No glows, gradients, radial patterns, or light effects.
- Use the scaffold's layout for positioning (text, device, screenshot placement)
- OPTIONALLY add a PRIMARY breakout element — but ONLY if there is an obvious, visually compelling UI panel on the app screen that directly relates to the benefit headline. If nothing clearly reinforces the headline, skip the breakout entirely. When used, it MUST be an entire UI panel or grouped section (NOT individual small elements like a single button or icon). The panel must stay at the SAME vertical position and orientation as on screen — do NOT rotate or angle it. The panel must be SCALED UP significantly — rendered much larger than it appears on the phone screen — so that it extends dramatically beyond BOTH left and right edges of the device frame, clearly overlapping the phone bezel on both sides, expanding to nearly the full width of the screenshot canvas. Do NOT keep the panel at its original on-screen size. The panel itself must be enlarged. It should appear to float in front of the device at this larger scale — add a soft drop shadow beneath it to create depth. The panel MUST come from the app screenshot — same colours, same style, same content. Do NOT invent new elements.
[PRIMARY BREAKOUT — if a relevant panel is obvious, describe the specific UI panel visible on screen to pop out with a drop shadow, extending beyond both device frame edges. Otherwise write "No breakout — the app screen speaks for itself."]
- Optionally add 1-2 secondary elements that reinforce the benefit and message of the screenshot — the kind of enhancements a professional graphic designer would add for impact. These are NOT from the app UI; they are creative additions that help clearly communicate what the screenshot is trying to portray to the user browsing the App Store. They should carry the message and support ASO conversion, but never at the cost of the overall design aesthetic. They must not compete with the primary breakout for attention.
[SECONDARY ELEMENTS (optional) — 0-2 small supporting elements that tell the story, or "None needed"]
- The breakout elements should match the style and energy level of those in the style template
The result must look like it was designed alongside the style template as part of the same professional set. When placed side-by-side in the App Store, they should be visually cohesive — same quality, same aesthetic, same design language, just different content.
No watermarks, no extra text, no app store UI chrome.
IMPORTANT — Consistency enforcement: The scaffold guarantees consistent layout. The style template guarantees consistent visual treatment. If Nano Banana changes the text, layout, or deviates from the style template, regenerate.
Step 3: IMMEDIATELY crop and resize ALL 3 versions to App Store dimensions
⚠️ You MUST run this immediately after all 3 edit_image calls complete. Do NOT show the user any image before running this. The raw Nano Banana output is always the wrong dimensions for App Store Connect.
CRITICAL — Use exactly ONE Bash tool call for all 3 crop/resize operations. Do NOT make 3 separate Bash calls. Do NOT use parallel Bash calls. Use the single loop below so the user only sees one permission prompt:
The script crops to the correct aspect ratio (top-center aligned — sides trimmed equally, top edge preserved so the headline stays put) and resizes to exact pixel dimensions. The resized image is saved as a separate file with -resized.jpg appended.
Target dimensions per display size — adjust TARGET_W and TARGET_H:
Present all 3 resized versions (the -resized.jpg files) to the user using the Read tool. Never show the raw Nano Banana output — always show the post-processed versions.
Label them clearly as Version 1, Version 2, and Version 3 and ask the user to pick their favourite or request changes.
Step 5: Iterate if needed
If the user wants changes, use edit_image with three images as input:
The scaffold (scaffold.png) — anchors the layout (text position, device placement, screenshot)
The style template (the first approved screenshot from screenshots/final/01-*.jpg) — defines the device frame rendering and overall visual style that must be consistent across the entire set
The approved design (the version the user liked best for this specific screenshot) — anchors the creative direction and breakout element approach
The prompt should reference all three:
Here are three reference images, each with a distinct purpose:
- FIRST image: The SCAFFOLD — use this as the definitive guide for layout: text position, device frame placement, and the app screenshot on screen. This defines WHERE everything goes.
- SECOND image: The STYLE TEMPLATE — this is the first approved screenshot in the set. The device frame rendering, text treatment, and overall visual style MUST match this exactly. This defines HOW the screenshot should look to maintain consistency across the set.
- THIRD image: The APPROVED DESIGN DIRECTION — this is the version the user liked best for this specific screenshot. Match its creative direction, breakout element approach, and secondary elements.
Generate a new version that keeps the layout from the scaffold, the device frame and visual style from the style template, and the creative direction from the approved design, with these changes:
[USER'S REQUESTED CHANGES]
This prevents drift (scaffold keeps layout locked), maintains set-wide consistency (style template keeps device frame and visual treatment identical), and preserves the creative direction the user already approved.
When iterating, generate 3 versions in parallel again (3 parallel edit_image calls in a single message). Then immediately run the Step 3 crop/resize loop on all 3 in a single Bash call before showing the user.
Repeat until the user is happy.
Step 6: Copy approved version to final/
Once the user picks a winner, copy the resized version to screenshots/final/:
This keeps final/ clean — only approved, App Store-ready screenshots, one per benefit, numbered in order. Then move to the next benefit.
Determine Brand Colour (Automatic)
Do NOT ask the user to pick a background colour. Instead, determine the best one automatically:
Analyse the codebase — check for accent colours, tint colours, brand colours in asset catalogs, theme files, colour constants, Info.plist
Study the simulator screenshots — what are the dominant colours in the UI? What colour palette does the app use?
Consider the app's domain and audience — a game can go bold and playful, a finance app needs confident and trustworthy colours
Pick a single colour that:
Complements the screenshots — makes the app screens pop, not clash. If the app UI is mostly white/light, use a bold saturated background for contrast.
Stops the scroll — vibrant, bold, saturated. Muted or pastel colours get lost in the App Store.
Suits the app's personality — match the energy of the app
Avoids pitfalls — no white/light grey (disappears against App Store), avoid colours too close to the app UI's dominant colour
Present your choice with brief reasoning (e.g., "Using #7B2D8E (deep purple) — it complements your app's colourful UI and stands out at thumbnail size"). The user can override if they want, but don't present it as a question.
The brand colour is saved to memory in Step 0 of the generation process, before scaffolding begins.
Output
Save generated screenshots to a screenshots/ directory in the project root, organised by benefit subfolder:
screenshots/
01-track-card-prices/ ← working versions for benefit 1
scaffold.png ← deterministic compose.py output (text + frame + screenshot)
v1.jpg ← Nano Banana enhanced version 1
v1-resized.jpg ← cropped/resized to App Store dimensions
v2.jpg
v2-resized.jpg
v3.jpg
v3-resized.jpg
02-search-any-card/ ← working versions for benefit 2
scaffold.png
v1.jpg
...
final/ ← approved screenshots, ready to upload
01-track-card-prices.jpg
02-search-any-card.jpg
The final/ folder is the only one the user needs to care about — it contains one approved, App Store-ready screenshot per benefit, numbered in order. The benefit subfolders contain all working versions and can be ignored or deleted after the set is complete.
Also tell the user exactly which App Store Connect display size slot each screenshot fits into.
Save to Memory
After each screenshot is generated (or after the full set is complete), save generation state to the Claude Code memory system. Create or update a memory file (e.g., aso_generated_screenshots.md) with:
Final file path (e.g., screenshots/final/01-track-card-prices.jpg)
Simulator screenshot used (file path)
Breakout elements described in the prompt
Status: generated / approved / needs-redo
Any user feedback or change requests noted
Update this memory incrementally — after each screenshot is approved, add it. Don't wait until the end. This way if the conversation is interrupted mid-set, the user can resume from the last completed screenshot.
Showcase Image
Once ALL screenshots in the set are approved and saved to final/, generate a showcase image that displays up to 3 of the final screenshots side-by-side with a GitHub link. Use the showcase.py script in the skill directory:
