Budgeting App Documentation Pack (React Native + Expo)

Generated: 2026-02-03

This zip contains product and technical documentation for a month‑centric personal finance budgeting mobile app built with React Native + Expo.

What’s inside

• product/ – PRD, personas, user stories, IA/UX notes, success metrics, release plan
• technical/ – architecture, data model, API spec, state management, offline/sync, visualization, security/privacy, testing, CI/CD, Expo setup
• diagrams/ – standalone Mermaid .mmd diagrams (can be previewed in Mermaid Live Editor or in many Markdown viewers)
• appendices/ – glossary + open questions

Key concept

The app is month-centric (and optionally pay-period-centric): users create budgets based on monthly or biweekly income and can see:

• Monthly breakdowns + charts
• Daily breakdowns
• “Left to spend today” (per category)
• “Left to spend this week” (per category)

Quick diagram preview

Open any .mmd file in a Mermaid viewer, or use the embedded Mermaid blocks in the Markdown docs (e.g., technical/Architecture.md).

Suggested implementation defaults (for the first release)

• Local-first (offline) using SQLite
• Manual transaction entry + optional CSV import
• Bank sync optional, via a small backend (Plaid-style flow)