JPZipAddress is an Android app developed by M.Ito soft that lets you search for postal codes and addresses offline. To use the app, you need to download the search data first. Once the search data is downloaded, you can search for postal codes and addresses offline.

The app allows you to copy and share the searched postal codes and addresses, and add them to your favorites list. You can also share your favorites list with other apps.

The app supports keyword search using kanji, hiragana, numbers, and other characters. You can use space to perform an AND search. The app treats "ケ" and "ヶ" (standard and small "ケ") and "が" and "ガ" as the same character. Similarly, "ツ" and "ッ" (standard and small "ツ") are treated as the same character. You can perform a NOT search by adding "!" at the beginning of the keyword (e.g. "!ビル" means "not ビル").

The search data is created by processing the "Postal Code Data Download" data provided by Japan Post.