Apple provides a really nifty tool called Smart App Banners that automatically prompts users to install your app when they visit your website on a mobile device. It works beautifully, looks clean, and drives a ton of installs!

https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/PromotingAppswithAppBanners/PromotingAppswithAppBanners.html

https://dwnld.me/install-smart-banner-promote-dwnld-app/

How to Install a Smart Banner to Promote your DWNLD App