인천e음, developed by KONA I CO. LTD, is a free Android app that combines a mobile app with an IC card to provide an electronic voucher for Incheon City. This innovative app is the first mobile-based IC card electronic voucher in the country and is available to anyone over 14 years old, including non-citizens. The electronic voucher is rechargeable and can be used at all affiliated stores in Incheon City except for department stores and large supermarkets.

The app also provides special benefits to members, including various linked services such as e-taxi, e-delivery, and e-mall. These services are continually updated on the Incheon City love voucher platform. Users can easily manage their card through the app, including checking their balance, transaction history, and benefits received. Additionally, the app offers a convenient way to apply for and receive the card, without the need to open a bank account or visit a bank.