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\n\n

The Standard for Shared Finance

\n Refracting the chaos of group expenses into clarity.\n

\n \n
\n\n [![Status](https://img.shields.io/badge/Status-Active_Development-brightgreen)]()\n [![Framework](https://img.shields.io/badge/Built_with-Expo_SDK_54-000.svg?logo=expo)]()\n [![React Native](https://img.shields.io/badge/React_Native-0.81-61DAFB.svg?logo=react)]()\n [![TypeScript](https://img.shields.io/badge/TypeScript-5.x-3178C6.svg?logo=typescript)]()\n

\n\n
\n\n## The Problem\n**Most expenses aren't split 50/50.**\n\nYou order a steak, they order a salad. You share an appetizer, but someone else had three drinks.\n- **\"Why am I paying for your cocktail?\"** — traditional \"even split\" apps are unfair.\n- **\"I'll figure out the math later.\"** — manual itemization on napkins is error-prone.\n- **\"Who had the extra side?\"** — confusion leads to social friction.\n\nThe result? You pay more than your fair share just to avoid the hassle.\n\n
\n\n## The Solution\n**PrismSplit: Item-Level Bill Splitting with AI Receipt Scanning.**\n\nWe built the system designed for **true fairness**. PrismSplit replaces \"even splits\" with granular precision, allowing everyone to pay exactly what they owe.\n\n- **Scan It.** Point your camera at a receipt — AI extracts every item in seconds.\n- **Itemize It.** Break down bills item-by-item with inline editing.\n- **Split It.** Equal, percentage, shares, or exact amounts — per item or per bill.\n- **Settle It.** Real-time balances, one-tap settlement.\n\n---\n\n## Key Features\n\n### AI Receipt Scanning\nCapture a receipt photo → AI extracts merchant, items, tax, tip → review and edit inline → create bill. Handles multi-image receipts with parallel upload and discount normalization.\n\n### Smart Bill Creation\n- **Dual-mode entry**: Simple amount or itemized breakdown\n- **Ledger-style item editor**: Focus-driven expandable rows, auto-advance keyboard flow, swipe-to-delete\n- **Auto-category detection**: Type \"uber\" → auto-selects Transport\n- **4 split methods**: Equal (toggle participants), Unequal (exact amounts), Percentage, Shares — with live redistribution\n\n### Groups & Social\n- **Invite links & QR codes** for instant group joining\n- **Guest members** — add friends who don't have the app yet; they claim their history on signup\n- **Multi-currency** support per group\n- **Group quota system** with tier-based limits\n\n### Financial\n- **Real-time balances** with animated number transitions\n- **Settlement tracking** with one-tap settle-up\n- **Bill-level and item-level discounts** — correctly calculated through the entire stack\n- **Tax & tip intelligence** — proportional or equal distribution with inline mode selector\n\n---\n\n## Tech Stack\n\n| Layer | Technology | Purpose |\n| :--- | :--- | :--- |\n| **Framework** | Expo SDK 54 + React Native 0.81 | Cross-platform mobile |\n| **Language** | TypeScript | Type safety |\n| **Backend** | Supabase | PostgreSQL, Auth, Realtime, Edge Functions, Storage |\n| **State** | Zustand + TanStack Query | Client state + server cache with optimistic updates |\n| **UI** | Tamagui | Compiled styles, theming, 60fps animations |\n| **Animations** | React Native Reanimated | Layout transitions, gesture-driven interactions |\n| **Storage** | MMKV + EncryptedStorage | Offline cache + secure keychain |\n| **AI** | Gemini (via Edge Functions) | Receipt OCR and item extraction |\n| **Analytics** | PostHog + Firebase + Sentry | Usage tracking, crash reporting, error monitoring |\n| **Validation** | Zod + React Hook Form | Runtime schema validation |\n\n### Design System\n4-font typography system with strict role separation:\n- **Sora** — Body text, inputs, descriptions\n- **Space Grotesk** — Page titles, hero text\n- **Outfit** — UI chrome: badges, labels, section headers\n- **SpaceMono** — Currency amounts, tabular numbers\n\nTheme-aware components with light/dark mode, brand color overrides, and 12-color avatar palette.\n\n---\n\n## Architecture\n\n```\nsrc/\n├── app/ # Expo Router (file-based routing)\n│ ├── (auth)/ # Auth screens (login, signup)\n│ ├── (tabs)/ # Main tabs (Home, Groups, Activity, Friends)\n│ ├── bill/ # Bill flows (create, edit, scan, review, processing)\n│ └── group/ # Group screens (details, settings, edit)\n├── components/\n│ ├── ui/ # Design system (Avatar, SwipeableRow, Button, etc.)\n│ ├── bill/ # Bill components (LedgerItemRow, SplitModal, etc.)\n│ ├── home/ # Dashboard (BalanceCard, SmartFeed, TopCircle)\n│ └── group/ # Group components\n├── hooks/ # Custom hooks (useThemeColors, useAnalytics, etc.)\n├── lib/\n│ ├── store/ # Zustand stores (auth, bills, groups, UI, quota)\n│ ├── services/ # Service layer (billService, notifications)\n│ ├── utils/ # Utilities (billCalculations, formatting)\n│ └── supabase.ts # Supabase client singleton\n├── theme/ # Design tokens, typography, themes\n└── types/ # Shared TypeScript interfaces\n```\n\n### Data Flow\n```mermaid\ngraph LR\n User -->|Interacts| UI[Tamagui UI]\n UI -->|Updates| Store[Zustand Store]\n Store -->|Syncs| Query[TanStack Query]\n Query -->|Persists| DB[(Supabase Postgres)]\n DB -->|Pushes| Realtime[Realtime Events]\n Realtime -->|Refreshes| UI\n Camera -->|Captures| Upload[Supabase Storage]\n Upload -->|Processes| Edge[Edge Function + Gemini]\n Edge -->|Returns| Review[Structured Items]\n Review -->|Creates| Store\n```\n\n---\n\n## Getting Started\n\n### Prerequisites\n- Node.js 18+\n- Expo CLI (`npm install -g expo-cli`)\n- iOS Simulator / Android Emulator / Physical device with Expo Go\n\n### Installation\n\n```bash\ngit clone https://github.com/architagrawal/prismsplit.git\ncd prismsplit/src\nnpm install\n```\n\n### Configuration\nCreate a `.env` file in `src/` with your Supabase credentials:\n```env\nEXPO_PUBLIC_SUPABASE_URL=https://your-project.supabase.co\nEXPO_PUBLIC_SUPABASE_KEY=your-anon-key-here\n```\n\n### Run\n```bash\nnpx expo start\n```\n\n---\n\n## Project Status\n\n**Active Development** — V1.1 shipped with AI receipt scanning, ledger-style item editor, and redesigned split flow.\n\n### Recent (April 2026)\n- Redesigned itemize modal with ledger-style inline editing\n- Redesigned receipt review screen with inline item editing\n- Redesigned split customization modal\n- Redesigned alert dialog system\n- Auto-advance keyboard flow across item fields\n- Scroll-synced keyboard management\n- Item validation with auto-focus on incomplete fields\n\n### Planned\n- Smart Feed with pending approvals and settle requests\n- Offline write queue with conflict resolution\n- Self-select flow (each participant claims their own items)\n\n---\n\n

\n Architecture • \n Features • \n Contributing\n

\n
\n

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