Number turns your device into a point-of-sale terminal so that you can view the details of a full EMV contactless transaction. The app also lets you use the read card's data to autofill online checkout forms. All you have to do is hold your contactless card near the NFC reader of your device, typically located in the upper part of the back of the device.

The app alone does not perform an actual transaction, this is simply for illustration. You won't be charged.

Main features:
- Fully offline app
- No login infrastructure.
- No plain card data is ever stored.
- Security check after new card is read.
- Autofill feature successfully tested in various apps, including those by major e-commerce platforms such as Amazon, eBay, and AliExpress.
- The curious cardholder can view a detailed log of the transaction performed between the card and the device.