Today there have been seen many situations utilizing mobile digital devices in business fields, and mobile applications for business have been actively developed to meet the demand. Among them, applications of POS and inventory management is the one of the most attractive software category. Based on this background, we have developed an Android application for inventory management named "Kantan-Zaikokanri". This application is designed to be easy-to-use for small stores to large organizations. For example data input/search/update work is easily possible because item data is manageable with JAN code and voice.