is a mobile operating system from Apple Inc., designed for the company's mobile devices. It uses the Darwin system with the XNU core, making it a category of Unix-like systems.

is an extensive open source platform that was created mainly for mobile devices (smartphone, PDA, navigation, tablet). It includes an operating system (based on Linux kernel), middleware, user interface and applications. It is being developed by the Open Handset Alliance.

and/or services

integration with Paypal, Stripe, 2Checkout or a bank card

e.g. table in restaurant, hotel room, schedule, service, product, etc.

Buy one, get one free