CashStack
A digital envelope budgeting app that helps users allocate their monthly budget into categorized envelopes, track spending per category, and monitor remaining balances with visual progress indicators. Features multiple budget periods, transaction history, dark mode, and data management.
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A digital envelope budgeting app that helps users allocate their monthly budget into categorized envelopes, track spending per category, and monitor remaining balances with visual progress indicators. Features multiple budget periods, transaction history, dark mode, and data management.
Project Overview
CashStack is a digital envelope budgeting application built with Flutter, designed to bring the classic envelope budgeting method into the modern mobile era. The app empowers users to take full control of their finances by organizing their monthly income into purpose-driven categories — or "envelopes" — making it easy to track every dollar spent.
Key features include a comprehensive dashboard with real-time budget health indicators, support for weekly, bi-weekly, and monthly budget cycles, individual envelope tracking with spending breakdowns and daily averages, and a complete transaction history per category. The app also includes biometric security, dark mode support, and efficient local data management.
Whether saving for education, managing health insurance premiums, or simply keeping daily spending in check, CashStack provides a clean, intuitive interface that makes budgeting feel effortless rather than restrictive.
The Approach & Solution
The development approach centered on creating a frictionless budgeting experience that feels native on both iOS and Android. We chose Flutter as the cross-platform framework to deliver pixel-perfect UI consistency and smooth 60fps animations across devices.
Architecture: The app follows a feature-first architecture with clear separation between UI, business logic, and data layers. State management is handled efficiently to ensure real-time updates when transactions are added or envelopes modified.
Design System: We built a custom design system using a dark teal and green color palette that evokes trust and financial health. The card-based UI with progress indicators provides at-a-glance budget status, while the donut charts in envelope detail views give users deeper spending insights.
Data Management: All financial data is stored locally on-device for privacy, with efficient storage management and the ability to export or reset data. The app calculates daily spending averages, remaining budgets, and funding percentages automatically.
User Experience: The onboarding flow is minimal — users can start budgeting within seconds. The three-tab navigation (Home, History, Settings) keeps the interface uncluttered while providing quick access to all core functions.