Dlužník is an Android app developed by maxricho that helps you keep track of your debts and loans. With this app, you can easily track who owes you money or who you owe money to, without the need for pen and paper. Besides, it also has a feature that allows you to lock the app to prevent unauthorized access.

The app is user-friendly and easy to navigate. You can add new debts or loans, edit existing ones, and delete them when they are paid off. It also provides a summary of your debts, including the total amount of debt and the number of debts. Additionally, the app allows you to export your data to an Excel file stored on the SD card.

Overall, Dlužník is a useful app for anyone who needs to keep track of their debts and loans. It is free to use and available on the Android platform.