Expense is a free iPhone app developed by Shan Cao that aims to make tracking money easy and intuitive. With its simple and beautiful line chart, users can easily visualize their expenses and track where their money is going.

One of the standout features of Expense is its fast expense tracking. Users can quickly enter the amount spent and select a category, and that's it. There is no need for complicated input fields or tedious manual calculations.

The app also offers a monthly view that allows users to see a breakdown of their expenses over time. This feature is particularly useful for those who want to analyze their spending habits and make informed financial decisions.

Expense also provides the option to export data to CSV for further processing. This allows users to easily import their expense data into other financial management tools or create custom reports.

Users can customize categories in the app's settings, making it easy to tailor Expense to their specific needs and preferences.

It's worth noting that all of the user's data is stored locally and not available to the developer or any third parties. This ensures the privacy and security of the user's financial information.

Overall, Expense - Spending Tracking is a user-friendly and feature-rich app that simplifies the process of tracking expenses and managing personal finances.