Goondori is a national military service calculator app designed for soldiers. It is a global day calculator with a simple and appealing design. The app provides real-time updates of the D-day, rank, percentage, and time left until the next rank and level. Users can adjust the promotion date and discharge date, and add photos of themselves or their loved ones to the calculator. The app also features a widget to check the D-day at any time, with the option of adjusting its transparency. Additionally, Goondori supports the function of registering multiple people, with the ability to register up to 12 individuals.

Overall, Goondori is a useful and practical app for soldiers, allowing them to keep track of their military service and important dates. It is free to use and available on the Android platform. The app has been well received, ranking 3rd in the App Store lifestyle category and 38th in all free apps. For any inquiries, users can contact the developer at