Zapper

Zapper is an Android app that connects you with the restaurants belonging to the network by the same name. It lets you pay your check with your smartphone, by using the QR code reader. Once you enter your bank information into the app, you can easily go out to eat without having to carry cash or credit cards.

The best thing about this app is it shows a detailed list of all the nearby restaurants that accept this payment method, along with information about each restaurant. When you finish eating, you get a check with a QR code. You just have to scan the code and enter your PIN to make the payment. Zapper also lets you leave tips, so you can pay without needing any cash at all.

Aside from the convenience the app provides, you can also find coupons and restaurant discounts that are only available to app users. If you're traveling abroad, this is a great payment method. It helps you avoid carrying credit cards or having to exchange currency just to go out to eat.

Zapper also gives you the option to only pay for your part of the check when you go out with friends, without needing a calculator to figure out how much you owe or waiting for the server to separate the checks. You can also use it in taxis and other types of stores, although it's currently not a very popular payment method, and it's still not easy to find stores that accept this type of payment.

Apart from all that, you can also just use it as a simple QR scanner, and view content in any browser you have installed. Pay instantly and never worry about losing your cash or credit card again.