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vroom 🏎️💨

vroom is an open source candlestick charting library that runs on iOS and Android via React Native and web via WASM beneath a React wrapper. The mobile and web implementation share a single C++ rendering core built on Skia, so charts stay smooth under pans, pinches, and live updates.

Mobile (iOS)Web/Desktop
vroom chart on mobilevroom chart on desktop

vroom currently supports 5 technical analysis indicators: RSI, VWAP, EMA, SMA, MACD and volume with more to come.

NOTE: native iOS and Android wrappers are in progress. Building the chart core in C++/Skia means it can and will be truly cross-platform.

Features​

Candles, Volume and Indicators​

Candlesticks and volume render by default. Chart colors, candle styling (wick width, rounded bodies and wicks, rounded volume bars), the initial candle width, indicator visibility and parameters are all configurable through the theme and prop surface. vroom does not (currently) offer chart chrome/toolbars to customize the chart and its indicators. This is done by the consuming app so you can have full control of the look feel of your product.

customizable chart
A customized, monochromatic vroom chart on web.

Gestures​

Navigating the chart feels natural and performs at 60+ FPS across all interactions.

smooth gestures
Industry-standard gestures perform at 60+ FPS

The chart crosshair surfaces chart level data so the host app can render OHLCV data and fire haptics. 
function Chart({ candles }) {
  return (
    <VroomChart
      candles={candles}
      onCrosshair={(e: CrosshairEvent) => {
        // e.reason → 'hide' || 'show'
        // e.timeMs → // crosshair datetime
        // e.candle → { open, high, low, close, volume } for your OHLCV readout
      }}
    />
  );
}

Drawing tools​

Vroom supports trendlines, rectangles and freehand pencil drawing. Drawings are persisted via an injected local storage adapter and are indexed by asset/market so the drawings are maintained across refreshes.

smooth gestures
Trendline, rect, and pencil supported

Get started​