"Saldo Certo" is an application designed to help users manage their personal finances in a practical and intuitive way. With a user-friendly interface and powerful features, the app allows users to record, categorize and track their income and expenses in detail, as well as offering important insights into their financial performance.

Main features:

Transaction Record:
The app allows the user to record financial transactions with ease. Transactions can be categorized as "Income" or "Spending", with the option to associate each one with custom categories, which helps to better organize data and visualize the types of expenses and earnings.

Custom Categories:
Users can create their own categories to classify transactions, facilitating detailed control of each financial area. Categories can be edited or removed as needed, and changes are synced to Firebase, ensuring access across different devices.

Financial Reports and Charts:
Reporting functionality allows users to track their spending and income over specific periods (daily, weekly, monthly, or yearly). Furthermore, the app offers interactive graphs (such as a pie or donut chart) that show the distribution of income and expenses, making it easier to visualize your finances.

Balance Projection:
The app projects the future balance based on recorded transactions. This feature helps visualize financial health, showing a forecast of the user's balance in the short and long term, considering past income and expenses.

Notifications and Alerts:
"Saldo Certo" sends notifications to alert the user about bill due dates and pending receipts, helping to avoid forgetfulness and providing more efficient control of cash flow.

Light and Dark Mode:
The app supports two themes: light and dark. Users can choose the mode that best suits their preferences or lighting conditions, ensuring a comfortable viewing experience.

Monetization with Ads:
To monetize, the app integrates Google AdMob ads, including banners and opening ads. The display of ads is done in a non-intrusive way, so that the user experience is not compromised.

Local and Cloud Storage:
The app uses Hive to store transactions locally, ensuring that data is saved securely on the device. Additionally, integration with Firebase allows custom categories to be stored in the cloud, offering synchronization between devices and facilitating remote access.

Authentication and Security:
Through Firebase Authentication, the app offers login via Google, ensuring the security of user data. The app also uses the Firebase Realtime Database to save each user's personalized categories, ensuring all information is kept secure and in sync.

Internationalization and Localization:
The app is fully localized into Brazilian Portuguese, with currency and date formatting adapted to the national standard. Furthermore, the time zone is configured for the Brazilian location, ensuring data accuracy in the local context.

In short, "Saldo Certo" offers a complete and practical solution for those who want to keep their personal finances organized, with features such as categorization, financial reports, balance projection, notifications and much more, all in an easy-to-use application and with the flexibility to choose the viewing mode that best suits the user.