💸 CashFlow — Modern Personal Finance App

CashFlow One is a modern, responsive React Native (Expo) app for tracking your personal finances.
It helps you manage all your income, expenses, and balance, with beautiful charts, dark/light mode, Google Sign-In, and full synchronization via Node.js + MongoDB Atlas backend.

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🚀 Features

• 📊 Track income and expenses with category, amount, and note
• 💰 Automatic balance calculation (profit/loss detection)
• 🌗 Dynamic Light/Dark mode with system theme auto-detection
• 💵 Multi-currency support (€, $, £, ¥, etc.)
• 📱 Responsive layout that adapts to all screen sizes
• 🔐 Authentication
  • Sign in with Google
  • Register/Login with email + password
  • OTP verification for mobile number (optional)
• ☁️ Cloud sync with Node.js backend and MongoDB Atlas
• 📈 Visual charts
  • 7-day bar chart
  • 12-month trend chart
  • Top categories summary
• ⚙️ Settings page for theme and currency preferences
• 🧠 Built with clean, modern UI and TypeScript

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🛠️ Tech Stack

Frontend (this repo)

• Expo SDK 54+
• React Native 0.81+
• TypeScript 5.9+
• expo-auth-session
• react-native-safe-area-context
• @expo/vector-icons
• AsyncStorage

Backend

• Node.js
• Express
• MongoDB Atlas
• Mongoose
• Google OAuth2 (google-auth-library)

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⚙️ Environment Setup

1️⃣ Clone the repository

git clone https://github.com/gabriel9010/cashflow.git
cd cashflow-one