REX Kiriman Express is an Android app developed by PT ROYAL EXPRESS INDONESIA that allows users to track the status of their packages and check the delivery cost. With a simple and easy-to-use interface, users can easily enter the tracking number and get real-time updates on the location and status of their packages.

The app also offers a feature to calculate the delivery cost for the package, making it convenient for users to know the exact cost before sending the package. The app is free to download and use, which makes it a great choice for those who frequently send and receive packages. Overall, REX Kiriman Express is a reliable and user-friendly app that simplifies the package tracking and delivery cost calculation process.