App Icon Size Reference

iOS specifies icon sizes in points, then multiplies by the device’s scale factor. The home-screen app icon is 60 pt, which becomes 120×120 px on @2x devices and 180×180 px on @3x devices like the Pro iPhones. Spotlight (40 pt), Settings (29 pt), and notifications (20 pt) each get the same @2x/@3x treatment, which is how a single app ends up needing eight-plus icon files. The 1024×1024 px marketing icon for the App Store sits outside this system — it is a fixed pixel size, must be opaque, and must visually match the on-device icon or you risk rejection under guideline 2.3.

Since Xcode 14 you can supply just the 1024 px master and let Xcode generate the smaller slots automatically, which works well for bold, simple designs. Icons with fine detail still benefit from hand-checked smaller sizes — automatic scaling has no opinion about whether your glyph is still recognizable at 58 px in Settings.

Google Play’s listing icon is exactly 512×512 px as a 32-bit PNG (alpha channel allowed in the format, though since the 2019 icon spec Google applies its own rounded-corner mask, so design full-bleed). On-device launcher icons follow density buckets: 48 px at mdpi scaling up through 96 px xhdpi to 192 px at xxxhdpi.

Adaptive icons, required in practice since Android 8.0, change the model entirely: you supply separate foreground and background layers on a 108×108 dp canvas, and the launcher masks them into a circle, squircle, or rounded square depending on the device. Only the central 66 dp diameter is guaranteed visible under every mask — logos or text that stray outside that safe zone get clipped on some launchers. The outer 21 dp on each side exists for parallax and motion effects, not for content.