고객관리자 is a free customer management app available for Android. It allows users to easily add, edit, and delete customers, as well as register sales for each customer.

Users can manage their product lists by category and write memos for each customer or sale. They also have the option to set a profile picture for each customer.

The app provides a search function that allows users to easily find customers and quickly access their information. Additionally, the statistics feature enables users to track customer preferences, monthly sales variations, product sales ratios, and customer ratios.

All data is stored locally on the device and can be exported or imported as a JSON file.

This app is particularly useful for service-oriented businesses such as beauty salons or small-scale stores.

Please note that the developer, Sutudio SSun, is currently developing a Pro version of the app. For more information, please visit their website.