# เข้าที่ (Khaoti) — Life & Finance Management

> เข้าที่ (Khaoti) is a private, zero-budget, local-first web application and PWA combining personal finance (income/expenses, on-device slip OCR scanner, multi-wallet budgeting), task management, and life journaling into a single 3-second Omnibar. All user data is stored strictly on-device in IndexedDB (Dexie.js) with zero external servers, zero telemetry, and zero ads.

## Core Value Proposition
- **Privacy & Security**: 100% Local-First. Financial records and personal notes never leave the user's device. Supports client-side AES-256 encrypted backups.
- **Speed & Offline**: Instant 0ms response time, works 100% offline via Progressive Web App (PWA) Service Worker.
- **3-Second Capture (Omnibar)**: Natural language parser for Thai and English. Users can type or speak "กินข้าว 60 กาแฟ 45" to log multiple financial items, tasks, and notes simultaneously.
- **On-Device Slip Scanner**: Scans Thai bank transfer slips (PromptPay / Mobile Banking) entirely on the client using local OCR with zero API calls.
- **Zero Cost & No Sign-up**: Completely free, no registration required, no subscription, no tracking cookies, and no advertisements.

## Key Features
- **Finance Engine**: Multi-wallet support (Cash, Bank, Credit Cards, Savings), integer satang calculation (zero floating-point errors), monthly category budgeting with smart burn-rate pace alerts, savings goals tracking with 1-tap deposits, recurring bills engine with month-end safety clamp.
- **Peer Debt & IOU Engine**: Tracks money lent and borrowed with 1-tap settlement and NLP omnibar logging ("ให้เพื่อนยืม 500", "ติดเงินแม่ 200").
- **Time & Tasks**: Smart rescheduling for overdue tasks, ambient daily timeline with infinite pagination, minute-boundary live clock.
- **Gentle Habits & Streak**: Compassionate streak tracking with 1 grace day to support mental wellness without punitive breaks.
- **Weekly Life Story Recap**: 7-day retrospective summary across money, time, and mind, formatted as a shareable life story card.
- **Export & Portability**: Generates RFC 4180 compliant CSV files with UTF-8 BOM for Microsoft Excel and Google Sheets without Thai font distortion, plus AES-256 encrypted .khaoti backup files.

## Technical Architecture
- **Frontend**: React 19, TypeScript, Vite
- **Storage**: IndexedDB managed via Dexie.js
- **Offline / PWA**: Web App Manifest & Service Worker
- **Audio & Haptics**: Web Audio API synthesized tones (zero external audio assets)
- **Styling**: Vanilla CSS custom properties with WCAG AA compliance across Dark Mode and Editorial Paper Light Mode

## URLs & Pages
- [App](https://khaoti.online/): The main progressive web application.
- [Landing & FAQ](https://khaoti.online/landing.html): Product landing page, feature highlights, and comprehensive FAQ.
- [Sitemap](https://khaoti.online/sitemap.xml): XML sitemap for search crawlers.