Simplicity Wins
Icons are viewed at tiny sizes. Good icons focus on a single shape or concept. Remove clutter and unnecessary details.
Scalability
Design as a vector. Test your icon at 20px (settings menu) and 1024px (app store). It must be recognizable at all sizes.
Color and Contrast
Use vibrant colors to stand out on various wallpapers. Ensure sufficient contrast between the foreground object and background.
Platform Standards
iOS icons are squarcles. Android uses Adaptive Icons (circle, square, squarcle). Don't bake the mask into the artwork.
Avoid Words
Text is unreadable on icons. Use the "first letter" or a symbol instead. Your app name is already displayed below the icon.
Testing Icons
Icons drastically affect conversion. A/B test variants using Play Store Experiments. A 10% conversion lift is significant.
Seasonal Variants
Update icons for holidays or major events. It signals the app is active and often boosts re-engagement.