App Store and Google Play screenshot creation with exact platform specs. Covers iOS/Android dimensions, gallery ordering, device mockups, and preview videos. Use for: app store optimization, ASO, app screenshots, app preview, play store listing. Triggers: app store screenshots, aso, app store optimization, play store screenshots, app preview, app listing, ios screenshots, android screenshots, app store images, app mockup, device mockup, app gallery, store listing
App Store and Google Play screenshot creation with exact platform specs. Covers iOS/Android dimensions, gallery ordering, device mockups, and preview videos. Use for: app store optimization, ASO, app screenshots, app preview, play store listing. Triggers: app store screenshots, aso, app store optimization, play store screenshots, app preview, app listing, ios screenshots, android screenshots, app store images, app mockup, device mockup, app gallery, store listing
allowed-tools
Bash(belt *)
Install the belt CLI skill:npx skills add belt-sh/cli
App Store Screenshots
Create app store screenshots and preview videos via inference.sh CLI.
belt login
# Generate a device mockup scene
belt app run falai/flux-dev-lora --input '{
"prompt": "iPhone 15 Pro showing a clean modern app interface with analytics dashboard, floating at slight angle, soft gradient background, professional product photography, subtle shadow, marketing mockup style",
"width": 1024,
"height": 1536
}'
Platform Specifications
Apple App Store (iOS)
Device
Dimensions (px)
Required
iPhone 6.7" (15 Pro Max)
1290 x 2796
Required
iPhone 6.5" (11 Pro Max)
1284 x 2778
Required
iPhone 5.5" (8 Plus)
1242 x 2208
Optional
iPad Pro 12.9" (6th gen)
2048 x 2732
If iPad app
iPad Pro 11"
1668 x 2388
If iPad app
Up to 10 screenshots per localization
First 3 screenshots are visible without scrolling (critical)
Formats: PNG or JPEG (no alpha/transparency for JPEG)
Google Play Store (Android)
Spec
Value
Min dimensions
320 px (any side)
Max dimensions
3840 px (any side)
Aspect ratio
16:9 or 9:16
Max screenshots
8 per device type
Formats
PNG or JPEG (24-bit, no alpha)
Feature graphic: 1024 x 500 px (required for featuring)
Promo video: YouTube URL (optional but recommended)
The First 3 Rule
80% of App Store impressions show only the first 3 screenshots (before the user scrolls). These three must:
Communicate the core value proposition
Show the best feature/outcome
Differentiate from competitors
Screenshot Gallery Order
Position
Content
Purpose
1
Hero — core value, best feature
Stop the scroll, communicate what the app does
2
Key differentiator
What makes you unique vs competitors
3
Most popular feature
The thing users love most
4
Social proof or outcome
Ratings, results, testimonials
5-8
Additional features
Supporting features, settings, integrations
9-10
Edge cases
Specialized features for niche users
Screenshot Styles
1. Device Frame with Caption
The standard: device mockup showing the app, caption text above/below.
The app UI fills the entire screenshot. Works for immersive apps.
3. Lifestyle Context
The device shown in a real-world context (person holding phone, on desk, etc.).
4. Feature Highlight with Callouts
UI screenshot with arrows/circles pointing to specific features.
Caption Writing
Rules
Max 2 lines of text
Benefit-focused, not feature-focused
30pt+ equivalent font size (must be readable in store)
Examples
❌ Feature-focused:
"Push Notification System"
"Calendar View with Filters"
"Data Export Functionality"
✅ Benefit-focused:
"Never Miss a Deadline Again"
"See Your Week at a Glance"
"Share Reports in One Tap"
Generating Screenshots
Hero Screenshot (Position 1)
# Clean device mockup with hero feature
belt app run falai/flux-dev-lora --input '{
"prompt": "modern iPhone showing a beautiful fitness tracking app with activity rings and workout summary, device floating at slight angle against soft purple gradient background, professional product shot, clean minimal composition, subtle reflection",
"width": 1024,
"height": 1536
}'
Feature Highlight
# Feature callout style
belt app run bytedance/seedream-4-5 --input '{
"prompt": "app store screenshot style, iPhone showing a messaging app with AI writing suggestions highlighted, clean white background, subtle UI callout arrows, professional marketing asset, modern design",
"size": "2K"
}'
Lifestyle Context
# Device in real-world setting
belt app run falai/flux-dev-lora --input '{
"prompt": "person holding iPhone showing a cooking recipe app, kitchen background with ingredients, warm natural lighting, over-the-shoulder perspective, lifestyle photography, authentic feeling",
"width": 1024,
"height": 1536
}'
Before/After
# Split comparison
belt app run infsh/stitch-images --input '{
"images": ["before-screenshot.png", "after-screenshot.png"],
"direction": "horizontal"
}'
Preview Videos
Apple App Store
Spec
Value
Duration
15-30 seconds
Orientation
Portrait or landscape (match app)
Audio
Optional (loops silently in store)
Format
H.264, .mov or .mp4
Google Play
Spec
Value
Source
YouTube URL
Duration
30s-2min recommended
Orientation
Landscape preferred
Preview Video Structure
Segment
Duration
Content
Hook
0-3s
Show the core outcome/wow moment
Feature 1
3-10s
Demonstrate top feature in action
Feature 2
10-18s
Second key feature
Feature 3
18-25s
Third feature or social proof
CTA
25-30s
End screen with app icon
# Generate preview video scenes
belt app run google/veo-3-1-fast --input '{
"prompt": "smooth screen recording style, finger tapping on a modern mobile app interface, swiping between screens showing charts and data visualizations, clean UI transitions, professional app demo"
}'
Localization
Each language gets its own set of screenshots. Priorities:
