MetalFolio started as a small itch: every precious-metals tracker I tried was either cluttered with ads or buried the one number I actually wanted — the live spot price. So I spent a weekend building a version that showed exactly that, and nothing else.
Under the hood it's a React Native CLI app rather than a managed Expo project — I wanted full control over native modules for the live price charts and widgets. Supabase handles auth and portfolio data, and RevenueCat manages subscriptions across platforms without me having to touch StoreKit or Play Billing directly.
Growth was almost entirely organic: a few App Store Optimization passes on the screenshots and keywords, a 5.0 rating from early users, and word of mouth in precious-metals communities. It's now used in 90+ countries, tracking gold, silver, platinum, palladium, and a handful of major cryptocurrencies.
Next up: a proper watchlist with price alerts, and finally shipping the Android build.