Zippa is an Android app that helps users search for postal codes in Japan. It has been providing the service since 2007 and is developed by yatta0622. The app has gained popularity, and it stands out for three main reasons. First, the app is lightweight, taking up only about 500KB of storage space. Second, Zippa is safe, as it does not collect any personal information such as location data. Third, the app provides up-to-date information every month, using data provided by Japan Post.

The app has two search modes: area selection and free input. The area selection mode narrows down the search by selecting the prefecture, city, and town/village in that order. The free input mode allows users to search by typing or speaking text. Zippa also features copy, map display, history, filter, and share functions. Users can search for general postal codes as well as codes for specific businesses or public institutions.

If you encounter any issues with the app, you can contact the developer via email or Twitter. However, the app is straightforward, and it is unlikely that you will face any problems using it.