Cryptrack

Cryptrack is a mobile app to track your cryptocurrency portfolio across multiple wallets and exchanges. Manually log buy/sell transactions, monitor real-time PnL, and visualize performance through charts — all in your preferred currency. Secured with biometric authentication, the app works fully offline and supports multiple portfolios with per-asset cost basis tracking.

An offline-first React Native (Expo) mobile app backed by a Go microservice. The app stores all portfolio data locally in SQLite and computes metrics via FIFO lot tracking in TypeScript. A lightweight Go API aggregates live prices from CoinGecko/CoinMarketCap and FX rates, serving them with multi-tier in-memory caching and singleflight deduplication. State is managed through React Context providers for portfolio, currency, theme, and biometric auth.