App promotion in website

App promotion banner
https://developer.apple.com/library/mac/documentation/AppleApplications/Reference/SafariWebContent/PromotingAppswithAppBanners/PromotingAppswithAppBanners.html

App Link Maker
http://linkmaker.itunes.apple.com/hk/

e.g. <meta name="apple-itunes-app" content="app-id=703990116" />