There are several excellent expense tracker apps available that can be used for tracking hostel expenses. Here are some of the best options:

1. Splitwise: This is a popular expense tracker app that is often used for splitting bills and tracking expenses with friends or roommates. It offers a range of features including the ability to add expenses and track payments, and it can send reminders and notifications for overdue payments.
2. Money Lover: This is an expense tracker app that offers a range of features including budget tracking, bill reminders, and the ability to add expenses and income. It also offers the ability to sync data across devices and generate reports and graphs for better visualization.
3. Expensify: This is an expense tracker app that offers a range of features including automatic receipt scanning, expense tracking, and report generation. It also offers the ability to integrate with accounting software and to track mileage for business travel.
4. HomeBudget: This is an expense tracker app that offers a range of features including budget tracking, bill reminders, and the ability to add expenses and income. It also offers the ability to sync data across devices and generate reports and graphs for better visualization.
5. Monefy: This is an expense tracker app that offers a range of features including budget tracking, expense tracking, and the ability to add expenses and income. It also offers the ability to sync data across devices and generate reports and graphs for better visualization.

These are just a few examples of the many expense tracker apps available for tracking hostel expenses. When choosing an app, consider the features you need and your level of comfort with the app’s security and privacy policies.