Crypto Calculator 2
Live crypto ⇄ fiat converter that lives in your menu bar (macOS) or system tray (Windows, Linux).
Rust + Tauri 2 core, zero-dependency HTML/CSS/JS UI. Prices from CoinGecko's free API (no key).
- Tray title shows the live BTC price (macOS/Linux; tooltip on Windows), refreshed every 60 s
- Top-100 coins with search (
/ or ⌘K), 24h change and 7-day sparkline
- Two-way converter: type in either field; 9 fiat currencies; quick amounts; copy buttons
- Light/dark follows the system; keyboard first:
Esc hides, ⌘R refreshes, ⌘Q quits
- Single instance; closing the window just hides it
Develop
npm install
npm run dev # run with hot reload
npm test # JS number helpers + Rust unit tests
npm run build # bundles for the current OS → src-tauri/target/release/bundle
Linux build deps: libwebkit2gtk-4.1-dev libayatana-appindicator3-dev librsvg2-dev.
Release builds (all platforms)
Push to main (or run the build workflow manually). GitHub Actions produces:
macOS universal .dmg/.app, Windows .exe (NSIS) + .msi, Linux .deb/.rpm/.AppImage.
Download them from the run's artifacts.
Builds are unsigned: on macOS right-click → Open the first time; on Windows choose "More info → Run anyway".
Layout
src-tauri/src/market.rs – CoinGecko fetch, currency allowlist, tray price formattingsrc-tauri/src/lib.rs – tray, window toggling, refresh loop, commandssrc/ – UI (main.js, num.js helpers, styles.css)design/ – logo + tray icon sources (npx tauri icon design/logo.svg regenerates app icons)legacy-swift/ – the original SwiftUI v1 (macOS only)
