Overview

SpendWise is a next-generation personal finance application built for Android and iOS. It combines robust expense tracking with cutting-edge Artificial Intelligence to automatically scan receipts and provide personalized financial advice.

While the mobile app is built with React Native and Expo, its Artificial Intelligence features are powered by a highly-optimized Next.js backend API, ensuring API keys remain completely secure and processing is blazing fast.

The Problem

Traditional expense tracking apps require tedious manual data entry and often present a raw list of transactions, making it hard to see where money actually goes. Furthermore, generating actionable insights from hundreds of transactions is a massive cognitive load for the average user.

The Solution

By leveraging the Google Gemini API and Groq, SpendWise completely automates the data entry process. Users simply snap a photo of a receipt, and the app handles the extraction and categorization. The built-in AI advisor acts as a personal accountant, providing contextual insights and conversational budgeting advice.

Key Features

AI Receipt Scanner: Instantly extracts the merchant, total amount, and categorizes the transaction automatically from a photo.
AI Financial Advisor: Chat with a dedicated AI assistant directly in the app to get personalized budgeting advice and insights into spending habits.
Advanced Analytics: Interactive charts to visualize cash flow and spending trends over time.
Multi-Wallet Architecture: Segregate funds into different wallets (Checking, Savings, Crypto, Cash) and track transfers between them.
Budget & Subscriptions: Create robust monthly budgets and keep track of active subscriptions to ensure no surprise charges.
Enterprise-Grade Security: Fully secured by Firebase Authentication and strict Firestore security rules.

Tech Stack & Architecture

Mobile App (Frontend)

Built with React Native (0.76.5) and Expo (54.0) for smooth cross-platform performance.
Expo Router (6.0) for modern, file-based navigation.
TypeScript for strict type-safety across the entire codebase.
Firebase Firestore for real-time NoSQL database syncing across devices instantly.
Cloudinary for a blazing-fast CDN storing highly compressed receipt images.

Web API & Marketing (Backend)

The marketing website and AI backend are hosted on a separate custom server.

Built with Next.js 15 (App Router) and Tailwind CSS (v4).
Exposes the /api/ai-receipt endpoint to securely process Cloudinary image URLs using Google Gemini and Groq, feeding structured financial data directly back to the mobile app.
Hosted on Vercel for instant edge deployment.

SpendWise: AI-Powered Personal Finance