NaggingMoney is a free Android app developed by Eclipse Technology Inc. that aims to make expense tracking fast, simple, and enjoyable. Unlike other finance apps that can be complicated to use, NaggingMoney features a chat-based interface that is similar to messaging apps. This makes it easy to use, especially for those who are already familiar with messaging apps.

NaggingMoney offers a variety of features, including a chat-based expense tracker that requires no learning curve, a built-in interface that makes recording expenses faster, and over a hundred categories and items that can be customized for easier selection. It also features a diverse cast of chat characters to make expense tracking more fun and engaging, and a vocabulary that updates itself automatically to make chatting more natural.

Additionally, NaggingMoney provides graphical analysis of expenses, daily reminders to track expenses, search functions that allow you to search for specific dates or items, and account management that links expenses and income to your account. It even supports scanning QR codes for electronic receipts.

Overall, NaggingMoney is an excellent expense tracker that is perfect for those who want to develop good expense tracking habits. It's fun, easy to use, and completely free.