Imported from appeeky/aso-skills (
skills/app-icon-optimization/SKILL.md) via skills.sh. Install upstream withnpx skills add appeeky/aso-skills --skill app-icon-optimization. Copyright stays with the author.
App Icon Optimization
You help design, audit, and A/B test app icons to maximize tap-through rate (TTR) — the percentage of users who tap your app after seeing it in search results or browse.
Why the Icon Is Your Most Impactful Asset
The icon is the first thing users see in search results — before the title, rating, or screenshots. A compelling icon can lift TTR by 20–40% with no other changes. In browse/charts, it's often the only visual element competing for attention.
Icon Design Principles
1. Simplicity at Small Size
Icons render at 60×60pt (iPhone search results). At that size, detail disappears.
- Maximum 2 elements
- No text (illegible at small sizes; Apple discourages it)
- Strong silhouette recognizable at a glance
- Test at 60×60px before finalizing
2. Color Contrast Against the App Store Background
The App Store has a white/light background (light mode) and dark background (dark mode).
- High contrast on both modes
- Avoid white icons — they disappear in light mode
- Avoid very dark icons — they disappear in dark mode
- Consider adding a subtle shadow or border on your icon background
3. Category Visual Language
Match and differentiate from your category norms:
| Category | Common patterns | How to stand out |
|---|---|---|
| Productivity | Blue, clean, minimal | Warmer colors, bolder marks |
| Health/Fitness | Green, orange, energetic | Premium dark, sophisticated |
| Finance | Blue, green, conservative | Bold, distinctive mark |
| Games | Bright, characters, action | Premium/dark if competitors are loud |
| Social | Round shapes, soft colors | Sharp, distinctive if feed is soft |
| Meditation | Purple, blue, calm | Unexpected contrast color |
| Photo/Video | Gradient, camera | Single strong mark |
Rule: Look at your top 20 competitors' icons. Then design to be immediately distinguishable.
4. Recognizable Mark
The icon needs a single, memorable mark — not a scene or a composition. Ask:
"Can someone describe this icon in 3 words?"
- ✅ "Red speech bubble" | ❌ "Someone using a phone with a gradient"
- ✅ "Bold orange flame" | ❌ "Abstract colorful shapes"
5. Brand Consistency
The icon is your brand mark in the App Store. It should:
- Match your app's primary color palette
- Be consistent with your splash screen, push notifications, and marketing
- Work as a favicon, social media avatar, and press kit asset
Icon Sizes Required
| Platform | Size |
|---|---|
| iPhone (App Store) | 1024×1024px (master) |
| iPhone (home screen) | 60×60pt @1x, @2x, @3x |
| iPad | 76×76pt @1x, @2x |
| Watch | 40×40pt – 44×44pt |
| Android adaptive icon | 108×108dp (safe zone 66×66dp) |
Submit a single 1024×1024px PNG (no transparency, no rounded corners — Apple applies the mask).
A/B Testing Icons
iOS — Product Page Optimization
- App Store Connect → Your App → Product Page Optimization → Create Test
- Create up to 3 icon variants
- Set traffic allocation (20–33% per variant)
- Run for minimum 7 days or until statistical significance
Access: App Store Connect → App Store → Product Page Optimization
Android — Play Store Experiments
- Play Console → Store listing experiments → New experiment
- Upload up to 3 icon variants
- Set traffic split
- Google reports install conversion rate per variant
What to Test
Test one variable at a time:
| Test | Variants |
|---|---|
| Color scheme | Same mark, 3 different background colors |
| Mark style | Flat vs illustrated vs 3D |
| Dark vs light | Dark background vs light background |
| Character vs abstract | Character-based vs geometric/abstract |
| With vs without text | Mark only vs mark + short text |
Reading Results
- Primary metric: Install conversion rate (impressions → installs)
- Minimum sample: 1,000+ impressions per variant for reliable signal
- Significance threshold: p < 0.05 or Appeeky/Play Console confidence indicator
Icon Audit
Evaluate your current icon against:
Clarity at 60×60px: [1–10]
- Recognizable mark at small size?
- No illegible text?
Color contrast: [1–10]
- Works on white (light mode)?
- Works on dark backgrounds (dark mode)?
Category differentiation: [1–10]
- Stands out from top 10 competitor icons?
Simplicity: [1–10]
- Max 2 elements?
- Describable in 3 words?
Brand alignment: [1–10]
- Consistent with app's visual identity?
Overall: [N]/50
Brief for Icon Designer
When briefing a designer:
App: [name and one-line description]
Category: [category]
Primary audience: [who uses it]
Brand colors: [hex values]
Mood/feeling: [premium / playful / trustworthy / energetic / calm]
What the icon should convey: [core value or identity]
What to avoid: [don't replicate competitor X, avoid Y]
Competitors to differentiate from: [list 3–5 with icons]
Reference icons I like: [list 3–5 from other apps]
Deliverables:
- 3 distinct concepts at 1024×1024px
- Each concept tested at 60×60px mockup in App Store search context
- Final: PNG, no alpha, no rounded corners
Related Skills
ab-test-store-listing— Full A/B testing methodologyscreenshot-optimization— Complement the icon with strong screenshotsandroid-aso— Android adaptive icon requirementsaso-audit— Icon is one factor in the full ASO score