Octopus Balance Reader is the first app to be able to read the balance of the Hong Kong Octopus Card. This app uses the technology of NFC (near field communication), which is a new and fast way of transferring data. This technology is used in smartphones and tablets.

NFC technology was first introduced in the Android operating system. This technology was later incorporated into other devices and used for many purposes, such as contactless payment and identification. It is now being used in smartphones and tablets for various purposes, such as the exchange of contact information, payment, and tickets.

The application of Octopus Balance Reader is based on the card reader of the Hong Kong Octopus Card, which is used to read the information on the card and transfer it to a mobile device.