iOS 7 (App Store teaser 002)

With less than two weeks left until the looming iPhone 5S/5C event, Apple is now reportedly asking developers to submit larger app icons optimized for the new iOS 7 resolutions. Because Apple has slightly enlarged app icons in iOS 7, third-party applications which support only iOS 6 icon sizes appear with a small white border on the iOS 7 Home screen.

The company wants to avoid this so it’s now demanding that developers submit app icons in the new iOS 7 120-by-120 pixel resolution for the iPhone and 152-by-152 pixels for the iPad…

9to5Mac has Apple’s email communication to a developer, making it clear iPhone apps must include square icons in both 57-by-57 pixels and 120-by-120 pixels. Native iPad apps need app icons formatted for 72-by-72, 76-by-76 and 152-by-152 pixels.

“Apple does not explicitly mention iOS 7 in the email, but the resolutions match iOS 7′s requirements,” the publication wrote.

This compares to iOS 6 Retina requirements: 114-by-114 pixels for the iPhone and 144-by-144 pixels for the iPad. According to Manbolo, the corner radius of iOS 7 icons has been changed slightly to allow for a smoother appearance, see below.

Icon corner radius (iOS 6 vs iOS 7)

Apple urging devs to update app icons is a tell-tale sign of an imminent iOS 7 launch.

Although new iPhones are not expected to be available on the United States and other key markets until September 20, Apple is expected to unleash the public iOS 7 build at the September 10 event, allowing existing users to install the software on their devices.