Square Register is an app that allows the user to turn an android device into a cash register. This particular point of sale software is designed to be used with the popular Square payment service, which is commonly used by small businesses. It allows payments in any form, including phone-to-phone payments.

The software is a product of Square, Inc. and is currently on version 4.44.3. The size of the download is relatively large, coming in at 60.89 megabytes. Currently, the software only supports the English language. The software is 100 percent free to use, and for the most part, so is Square's services. However, a fee is charged for credit card transactions and other premium services, including a few physical point-of-sale pieces of equipment, can be purchased.