One chart API. Native everywhere.

yarn add @hzblj/zyplot

npx expo prebuild
npx expo run:ios
npx expo run:android

import { Chart } from '@hzblj/zyplot'

export function Revenue() {
  return (
    <Chart.Line
      categories={['Jan', 'Feb', 'Mar']}
      format={{ prefix: '$' }}
      series={[{ id: 'revenue', label: 'Revenue', values: [42, 56, 51] }]}
    />
  )
}

forecast.ios.tsx      imports @hzblj/zyplot/ios
forecast.android.tsx  imports @hzblj/zyplot/android
forecast.tsx          optional web or fallback version

// forecast.ios.tsx
import { Chart } from '@hzblj/zyplot/ios'

export const Forecast = ({ bands }: ForecastProps) => (
  <Chart.Range data={bands} height={300} />
)

// forecast.android.tsx
import { Chart } from '@hzblj/zyplot/android'

export const Forecast = ({ bands }: ForecastProps) => (
  <Chart.Lollipop data={bands.map(toPoint)} height={300} />
)

// price.ios.tsx
import { Chart } from '@hzblj/zyplot/ios'

export function Price() {
  return (
    <Chart.Candlestick
      data={candles}
      format={{ prefix: '$' }}
      onInteraction={(event) => console.log(event.category, event.value)}
      showVolume
    />
  )
}

// spend.android.tsx
import { Chart } from '@hzblj/zyplot/android'

export function Spend() {
  return (
    <Chart.Waterfall
      data={movements}
      format={{ prefix: '$', decimals: 0 }}
      interaction={{ haptics: true, tooltip: true }}
    />
  )
}

<Chart.Provider
  theme={{
    colors: {
      categorical: ['#7c3aed', '#0284c7', '#ea580c'],
      grid: '#e5e7eb',
    },
    typography: {
      fontFamily: 'Geist, sans-serif',
    },
  }}
>
  <Dashboard />
</Chart.Provider>

type ChartTheme = {
  colors?: {
    /** Slots 1…7, in order. A series takes one by index or by its own slot. */
    categorical?: string[]
    /** Low → high, five steps. Heatmap, treemap, sunburst. */
    sequential?: string[]
    /** Signed scales: diverging bars, and any positive/negative encoding. */
    diverging?: {
      negative?: string
      negativeSoft?: string
      neutral?: string
      positive?: string
      positiveSoft?: string
    }
    /** The de-emphasis grey — every series that is context rather than subject. */
    muted?: string
    axis?: string
    grid?: string
    /** Axis and data labels. */
    label?: string
    /** Tooltip fill. */
    surface?: string
    /** Tooltip hairline. */
    border?: string
    /** The unfilled part of a gauge or a meter. */
    track?: string
  }
  typography?: {
    /** A resolved family name. A canvas cannot read var(--font-sans). */
    fontFamily?: string
  }
}

<Chart.Provider surface={{ background: '#fff', cornerRadius: 16, padding: 12 }}>
  <Chart.Line categories={categories} series={series} />
  <Chart.Bar surface={{ cornerRadius: 24 }} categories={categories} series={series} />
</Chart.Provider>

:root {
  /* Categorical: slots 1…7, in the order series take them. */
  --zyplot-color-categorical-1: #4400fc;
  --zyplot-color-categorical-2: #0092de;
  --zyplot-color-categorical-3: #ff5700;
  --zyplot-color-categorical-4: #9c74ff;
  --zyplot-color-categorical-5: #00a546;
  --zyplot-color-categorical-6: #006fac;
  --zyplot-color-categorical-7: #ff133c;

  /* Sequential: low → high. Heatmap, treemap, sunburst. */
  --zyplot-color-sequential-1: #b89bff;
  --zyplot-color-sequential-2: #9c74ff;
  --zyplot-color-sequential-3: #7135ff;
  --zyplot-color-sequential-4: #4400fc;
  --zyplot-color-sequential-5: #2f00ae;

  /* Diverging: signed scales. */
  --zyplot-color-diverging-negative: #d23100;
  --zyplot-color-diverging-negative-soft: #ff7d4f;
  --zyplot-color-diverging-neutral: #d9d9d9;
  --zyplot-color-diverging-positive-soft: #59c4fd;
  --zyplot-color-diverging-positive: #006fac;

  /* Chrome. */
  --zyplot-color-axis: #a6a6a6;
  --zyplot-color-grid: #f5f5f5;
  --zyplot-color-label: #666666;
  --zyplot-color-muted: #808080;
  --zyplot-color-surface: #fcfcfc;
  --zyplot-color-border: #f5f5f5;
  --zyplot-color-track: #ebebeb;

  --zyplot-font-family: inherit;
}

/* Only the keys you actually change need restating per mode. */
[data-theme='dark'] {
  --zyplot-color-categorical-1: #7135ff;
  --zyplot-color-grid: #212121;
}

type ChartSeries = {
  /** Stable identity: the React key, and how hover correlates across charts. */
  id: string
  /** Already-translated display name, used by the legend and the tooltip. */
  label: string
  /** One value per category. null is a genuine gap, drawn as one, never as zero. */
  values: (number | null)[]
  /** Palette slot, 1-based. Pin it when the caller can hide series. */
  slot?: number
  /** Overrides the active palette for this series. */
  color?: string
}

const series: ChartSeries[] = [
  {
    id: 'revenue',
    label: 'Revenue',
    values: [42, 56, null, 72],
    slot: 1,
    color: '#16a34a',
  },
]

type ChartDatum = {
  id: string
  label: string
  value: number
  slot?: number
  color?: string
}

type ChartAxes = {
  x?: boolean
  y?: boolean
}

type ChartNumberFormat = {
  /** Fraction digits. Defaults to 0. */
  decimals?: number
  /** BCP 47 tag for grouping and decimal separators. Defaults to the runtime locale. */
  locale?: string
  /** Rendered before the number — a currency symbol, typically. */
  prefix?: string
  /** Rendered after the number — a unit or a percent sign. */
  suffix?: string
}

type ChartLegendItem = {
  id: string
  label: string
  color: string
}

/** Chart.Radar — one axis per row. Axes are scaled independently. */
type ChartRadarAxis = {
  label: string
  max: number
}

/** Chart.Heatmap — addressed by axis index; null renders empty, not as the ramp's low end. */
type ChartHeatmapCell = {
  columnIndex: number
  rowIndex: number
  value: number | null
}

/** Chart.Dumbbell — a before → after pair per row. */
type ChartDumbbellRow = {
  id: string
  label: string
  before: number
  after: number
}

/** Chart.Boxplot — the five-number summary, plus outliers you have already picked. */
type ChartBoxplotGroup = {
  id: string
  label: string
  min: number
  q1: number
  median: number
  q3: number
  max: number
  outliers?: number[]
}

/** Required, because "Q1" is not a word every reader of your product knows. */
type BoxplotLabels = {
  min: string
  q1: string
  median: string
  q3: string
  max: string
}

/** Chart.Sankey — nodes, and the weighted edges that address them by id. */
type ChartFlowNode = {
  id: string
  label: string
  slot?: number
  color?: string
}

type ChartFlowLink = {
  source: string
  target: string
  value: number
}

/** Chart.Treemap and Chart.Sunburst — leaves carry a value, parents sum their children. */
type ChartHierarchyNode = {
  id: string
  label: string
  value?: number
  children?: ChartHierarchyNode[]
  slot?: number
  color?: string
}

/** Chart.Scatter — an unordered two-measure space. size turns points into bubbles. */
type ChartScatterSeries = {
  id: string
  label: string
  points: Array<{
    x: number
    y: number
    size?: number
    label?: string
  }>
  slot?: number
  color?: string
}

/** Chart.TimeSeries — parallel arrays, because that is what uPlot consumes. */
type ChartTimePoints = {
  /** Unix seconds, strictly ascending. */
  timestamps: number[]
  /** One entry per series, each as long as timestamps. */
  values: (number | null)[][]
}

type ChartCandlestickDatum = {
  id: string
  category: string
  open: number
  high: number
  low: number
  close: number
  volume?: number
  /** Unix seconds. */
  timestamp?: number
}

type ChartCandlestickStyle = {
  upColor?: string
  downColor?: string
  neutralColor?: string
  /** Draws rising candles as outlines — the convention on most trading desks. */
  hollowUp?: boolean
  candleWidth?: number
  wickWidth?: number
  volumeUpColor?: string
  volumeDownColor?: string
  /** Share of the plot height the volume histogram takes. */
  volumeHeightRatio?: number
}

type ChartAxisOptions = {
  visible?: boolean
  label?: string
  /** "auto" | "category" | "linear" | "log" | "time" */
  scale?: ChartAxisScale
  /** Pins the extent. Omit either end to keep it computed. */
  domain?: { min?: number; max?: number }
  format?: ChartNumberFormat
  grid?: boolean
  gridDash?: number[]
  labelRotation?: number
  /** Which side the axis is drawn on: "start" | "end". */
  position?: ChartAxisPosition
  reversed?: boolean
  /** A hint, not a guarantee — the engine still picks readable ticks. */
  tickCount?: number
  /** Exact ticks, when the reader is looking for specific ones. */
  tickValues?: (number | string)[]
}

type ChartAnnotation =
  | ChartLineAnnotation
  | ChartRangeAnnotation
  | ChartPointAnnotation
  | ChartTextAnnotation

/** A target, a threshold, a launch date. */
type ChartLineAnnotation = {
  type: 'line'
  id: string
  axis: 'x' | 'y'
  value: number | string
  label?: string
  color?: string
  dash?: number[]
}

/** A shaded span — a quarter, an incident window, a tolerance band. */
type ChartRangeAnnotation = {
  type: 'range'
  id: string
  axis: 'x' | 'y'
  start: number | string
  end: number | string
  label?: string
  color?: string
  opacity?: number
}

type ChartPointAnnotation = {
  type: 'point'
  id: string
  x: number | string
  y: number
  label?: string
  color?: string
  symbol?: ChartSymbol
}

type ChartTextAnnotation = {
  type: 'text'
  id: string
  text: string
  x?: number | string
  y?: number
  color?: string
}

type ChartInteraction = {
  /** "axis" | "nearest" | "series" | "none" */
  hover?: ChartHoverMode
  /** "both" | "x" | "y" | "none" */
  crosshair?: ChartCrosshairMode
  tooltip?: boolean
  /** "single" | "multiple" | "none" */
  selection?: ChartSelectionMode
  pan?: boolean
  zoom?: boolean
  /** How far a hovered mark grows. */
  highlightScale?: number
  /** How far the rest fades while one mark is hovered. */
  dimOpacity?: number
  /** Native only — the web has no honest equivalent. */
  haptics?: boolean
}

type ChartInteractionEvent = {
  seriesId?: string
  category?: string
  value?: number
  x?: number
  y?: number
  /** Unix seconds, on the time-based forms. */
  timestamp?: number
  /** Pointer position in the native view's coordinate space. */
  nativeX?: number
  nativeY?: number
}

type ChartPlotStyle = {
  backgroundColor?: string
  borderColor?: string
  borderWidth?: number
  borderRadius?: number
  /** Clips marks to the plot area — the honest choice when a domain is pinned. */
  clip?: boolean
  padding?: number | { top?: number; right?: number; bottom?: number; left?: number }
}

type ChartSeriesStyle = {
  color?: string
  strokeWidth?: number
  strokeDash?: number[]
  fillOpacity?: number
  opacity?: number
  /** "circle" | "diamond" | "square" | "triangle" | "none" */
  symbol?: ChartSymbol
  symbolSize?: number
}

type ChartAnimation = {
  enabled?: boolean
  /** The entrance. Turn it off for a chart that re-renders on every keystroke. */
  initial?: boolean
  /** The transition when data changes under a mounted chart. */
  updates?: boolean
  duration?: number
  delay?: number
  /** "linear" | "ease-in" | "ease-out" | "ease-in-out" | "spring" */
  easing?: ChartAnimationEasing
}

<Chart.Line
  categories={categories}
  height={320}
  isLoading={revenue.isPending}
  series={series}
/>

<Suspense fallback={<Chart.Line.Skeleton height={320} legendCount={2} />}>
  <Revenue />
</Suspense>

function RevenueSkeleton({ height = 320 }) {
  return (
    <div
      aria-label="Loading revenue chart"
      aria-busy="true"
      role="status"
      style={{ height }}
    >
      <div className="skeleton-title" />
      <div className="skeleton-plot" />
    </div>
  )
}

<Chart.Line
  isLoading
  skeleton={<RevenueSkeleton height={320} />}
  height={320}
  axis={{ x: false, y: true }}
  categories={categories}
  series={series}
/>

<Chart.Frame
  title="Revenue"
  description="Monthly recurring revenue"
  caption="Source: billing ledger"
>
  <Chart.Line categories={categories} series={series} />
</Chart.Frame>