What are some alternatives?
AppIconizer - Icon generator for App Store & Play Store submissions.
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
App Icon Generator - Generate your app icons in milliseconds!
Logo Foundry - Logo Foundry is a professional Logo Design Suite App for Android and iOS that let's you create professional branding for your business in Minutes.
App Icon Maker - Create icons for mobile app stores online for free.
LogoScopic - Create a logo in minutes on your iPhone