GreenLight

# GreenLight > Free, privacy-first financial planning tool that runs entirely in your browser. ## What is GreenLight? GreenLight is a browser-based financial planning tool that helps users: - Understand their complete financial picture (assets, income, expenses, obligations) - Calculate accurate tax estimates using progressive federal and state tax brackets - Plan major purchases (homes, vehicles) with detailed cost breakdowns - Compare mortgage lenders with opportunity-cost-adjusted analysis - Project financial readiness timelines ## Key Features - **No account required** — all data stored locally in the browser - **Privacy-first** — no user financial data leaves the device; all portfolio and tax data is stored locally. Live price feeds require outbound calls to Gemini, CoinGecko, Yahoo Finance, and Finnhub. - **Progressive tax engine** — all 50 US states, 4 filing statuses, NIIT, LTCG stacking - **Mortgage calculator** — amortization, PMI analysis, points break-even with opportunity cost - **Lender comparison** — side-by-side with buy-down signal (green/yellow/red) - **Purchase planning** — home and vehicle cost breakdowns with liquidation analysis - **Real-time prices** — crypto (Gemini, CoinGecko), stocks (Yahoo Finance, Finnhub) - **Import support** — Fidelity CSV portfolio positions ## How to Use 1. Visit the app and complete the setup wizard (income, expenses, accounts) 2. Add assets manually or import from supported brokerages 3. View your dashboard for net position and tax summary 4. Navigate to the Purchase page and select a category (home or vehicle) to unlock mortgage and lender comparison tools 5. Check the Readiness page for a timeline to your purchase goal ## Technical Details - Built with React 19 + Vite - Data persists in localStorage + IndexedDB (no server required) - Self-hostable — deployable via Docker or any static host ## Links - App: https://gotthegreenlight.com/