Square Register POS is a mobile phone app available on Google Play and the App Store. The system is designed to run on a tablet or smartphone. Key capabilities include sales reports, inventory and digital receipts, as well as valuable analytics information.

The software provides regular free updates, which equip companies with new features to help run their business more effectively and efficiently. It also allows users to populate a spreadsheet with historic sales data for tax calculations.

Square Register works offline by providing a recording of transactions even when the Internet is down by storing the data locally, and automatically syncs all information when the user is connected again.