A free program for Android, by SVALBARD.K.
You can use this app to track the location of your package and find out the status of your shipment, even if the sender is not a part of this app. It is recommended for those who want to save time and avoid duplicate work.
In addition, it allows you to track any courier service at once, and displays where you are now in an easy-to-understand manner.
You can also scan the barcode to track your luggage information.
This app supports the parcel information of more than 700 domestic and overseas companies, including Japan Post, Kuroneko Yamato, Sagawa Express, and Amazon.