WooCommerce is the shopping cart system we use the most today.
It is powerful, modular and built into WordPress but now it also has an iPhone app to make it even better.
Your store in your pocket
With WooCommerce iOS you can keep your finger on the pulse of your online store – wherever you might be. With detailed product catalog and customer order views, as well as reporting facilities to view your business’s sales performance it’s the perfect tool for any WooCommerce user with an iPhone.
More Details here.