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FinOS

A Local-First AI-Powered Personal Finance Operating System (Built in Rust)

🚀 Overview

FinOS is a multi-platform, AI-powered personal finance engine built around a modular Rust core.

It enables users to track, analyze, and optimize:

  • Daily expenses (UPI, Cash, Cards, Net Banking)
  • SIP investments with projected growth simulation
  • Recurring subscriptions
  • Lending & borrowing records
  • Hierarchical spending categories (e.g., Travel → Metro → Flights → Cabs)

Designed as a privacy-first, local-first financial system, FinOS can be accessed via:

  • Linux Terminal (CLI)
  • Web Interface
  • Windows Desktop App
  • Android Mobile App

FinOS is not just an expense tracker — it acts as a personal financial intelligence layer.

🧠 Core Philosophy

  • Local-first architecture
  • Modular Rust-based core engine
  • Self-hostable backend
  • Privacy-focused data ownership
  • AI-assisted personalization
  • Cross-platform accessibility

🛠 Tech Stack

🧱 Core Engine

  • Rust (modular library crate)
  • serde (serialization)
  • sqlx / rusqlite (database layer)
  • chrono, uuid
  • argon2 + ring (encryption & key derivation)

🌐 Backend API

  • Axum (REST API layer)
  • SQLite (local storage)
  • PostgreSQL (optional cloud sync)

🖥 Desktop Application

  • Tauri

    • Rust backend
    • Web-based UI
    • Cross-platform desktop support

🌍 Web Frontend

  • Leptos (Rust-native web UI) OR
  • React (optional frontend layer)

📱 Android Application

  • Rust core compiled as shared library
  • Kotlin UI via JNI OR
  • Flutter + Rust FFI bridge

🤖 AI Layer

  • Rule-based keyword classification (Phase 1)
  • Embedding-based semantic categorization (Phase 2)
  • User correction learning system
  • Optional LLM integration

🔥 Key Features

💳 Expense Tracking

  • Payment mode detection (UPI, Cash, Cards)
  • Hierarchical category system
  • AI-based sub-category classification
  • Monthly & predictive analytics
  • Digital vs physical spending ratio

📈 SIP Investment Engine

  • Monthly investment tracking
  • Future value projection
  • Return rate simulation
  • Long-term portfolio estimation

🔁 Subscription Management

  • Recurring billing engine
  • Renewal reminders
  • Annual cost breakdown
  • Subscription waste detection

💰 Lending & Loan Ledger

  • Track money lent or borrowed
  • Repayment logging
  • Outstanding balance calculation
  • Optional interest computation

📊 Smart Analytics

  • Monthly burn rate analysis
  • Category drift detection
  • Spending pattern intelligence
  • Personalized financial insights

🏗 Architecture Overview

                ┌──────────────┐
                │   Android    │
                └──────┬───────┘
                       │
 Linux CLI ─────────▶  Rust Core Engine  ◀──────── Desktop App
                       │
                ┌──────▼───────┐
                │   Backend    │
                └──────┬───────┘
                       │
                ┌──────▼───────┐
                │   Database   │
                └──────────────┘

The Rust core acts as the shared financial logic layer across all platforms.

🗄 Database Design (High-Level)

  • expenses
  • categories (hierarchical tree structure)
  • payment_modes
  • sips
  • subscriptions
  • loans
  • loan_transactions
  • user_category_overrides
  • embeddings (optional AI layer)

🔐 Security

  • Encrypted local database
  • Password-derived key (Argon2)
  • Optional biometric unlock (mobile)
  • Self-hostable backend for full data ownership

📌 Use Cases

  • Power users managing detailed personal finances
  • Investors tracking SIP growth
  • Individuals managing informal lending
  • Privacy-focused users avoiding third-party finance apps
  • Developers exploring multi-platform Rust architectures

🌱 Future Roadmap

  • AI receipt OCR
  • Automated UPI SMS parsing
  • CSV import/export
  • Multi-currency support
  • Net worth dashboard
  • P2P sync with CRDTs
  • Self-hosted deployment toolkit

💡 Vision

FinOS aims to become:

A local-first, AI-powered financial operating system — giving users complete control over their money, insights, and data.

📜 License

MIT (Planned)

If you’d like, I can also generate:

  • A clean folder structure layout
  • A CONTRIBUTING.md
  • A technical architecture deep-dive document
  • Or a more startup-oriented pitch version for GitHub visitors