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Uncertainty chart

Error bars for estimates with their confidence intervals, and ribbons for percentile bands or a forecast over time. You compute the bounds and the chart draws them.

TanStack Charts

PreviewCode

Installation

The command adds the example above to components/charts/ and, the first time, the chart kit to components/ui/charts/. Both are source files in your project from then on: read them, change them, delete what you don't use.

Free with an account. It carries your token, so the CLI installs everything in one go.

Google GitHub

Use email insteadNo credit card

Usage

Each row has a category, an estimate and the interval's two bounds. Point <ErrorBar> at them with dataKey, lowKey and highKey.

import {
  BarXAxis,
  BarYAxis,
  ChartTooltip,
  ErrorBar,
  ErrorBarChart,
  Grid,
} from "@/components/ui/charts";

const data = [
  { name: "Control", rate: 3.2, low: 2.8, high: 3.6 },
  { name: "New pricing page", rate: 3.9, low: 3.4, high: 4.4 },
  { name: "Annual by default", rate: 3.5, low: 3.1, high: 3.9 },
];

export const ExperimentChart = () => (
  <ErrorBarChart
    ariaLabel="Trial conversion by variant"
    data={data}
    reference={3.2}
  >
    <Grid horizontal />
    <ErrorBar
      dataKey="rate"
      highKey="high"
      intervalLabel="95% CI"
      label="Conversion"
      lowKey="low"
    />
    <BarXAxis />
    <BarYAxis />
    <ChartTooltip />
  </ErrorBarChart>
);

Anatomy

Two charts share this page. ErrorBarChart puts an interval on each category and is the one laid out here. RibbonChart, for ranges over time, has its own section below.

<ErrorBarChart data={data} reference={4.1} xDataKey="variant">
  <Grid horizontal />
  <ErrorBar dataKey="rate" highKey="high" lowKey="low" />
  <BarXAxis />
  <BarYAxis />
  <ChartTooltip />
</ErrorBarChart>

ErrorBarChart: Gives each row a band. reference adds a dashed line at one value, such as the control or zero.
Grid: Guide lines across the value axis.
ErrorBar: The interval from lowKey to highKey, a cap on each end and a dot on the estimate.
BarXAxis: The categories, or the values on a horizontal chart.
BarYAxis: The values, or the categories on a horizontal chart.
ChartTooltip: The estimate and its interval, named by label and intervalLabel.

Forest plots

With orientation="horizontal" the intervals run left to right and the categories go down the side, the usual layout for a forest plot. Set reference={0} to draw the line of no effect, and widen margin.left for long labels.

PreviewCode

Ribbons over time

RibbonChart takes rows with a date under xDataKey (date by default) and uses XAxis and YAxis for its axes. Each <Ribbon> fills the space between lowKey and highKey, and each <RibbonLine> draws a line through dataKey.

Ribbons draw in the order you write them. Put the widest first with the lowest fillOpacity, so nested bands read from the outside in.

PreviewCode

Forecasts

A line or ribbon skips the rows where its fields are missing, so the actuals can stop where the forecast starts. Give the forecast's first row the last actual value, with both bounds equal to it, and the intervals fan out from there.

Mark the forecast with strokeDasharray="5 5" on its <RibbonLine>.

PreviewCode

Customization

The kit is in your project, in components/ui/charts/: your framework's components over a shared core/. Change a default there and every chart picks it up.

class goes on the chart's container, so size and spacing are utility classes.

<ErrorBar> takes color, strokeWidth for the interval, radius for the estimate's dot, and showCaps and capWidth (14 px) for the caps. A row with its own color field gets that color on its interval and caps, which is a quick way to pick out the winning variant.

Name the interval with intervalLabel so the tooltip says what it is. The default is "Range".

<ErrorBar
  capWidth={8}
  color="var(--chart-2)"
  dataKey="rate"
  highKey="high"
  intervalLabel="90% interval"
  label="Conversion"
  lowKey="low"
  radius={4}
/>

Where a part renders content of its own, you pass it in. In Solid:

ChartTooltip: content={({ point, index }) => …}

Loading state

Both charts take status="loading": the marks turn into a shimmering skeleton and the pointer is ignored until you switch to "ready", which plays the entrance.

With nothing to pass yet, render <ErrorBarChartLoading /> or <RibbonChartLoading /> in the chart's place.

PreviewCode

Animation

Each interval grows from its low end to its high end, one category after another, over animationDuration (1100 ms). The estimate pops in partway and the caps fade in once the intervals are out. Ribbons and lines wipe in from left to right instead.

Pass animate={false} to either chart to skip the entrance.

Theming

Every color in the kit is one of your theme's tokens or a mix of them, except --chart-positive, a fixed green. A preset or the .dark class restyles the chart, and overriding a token in your CSS changes it everywhere.

Intervals, estimates, ribbons and lines all default to --chart-1. The reference line uses --chart-foreground-muted, so it reads as a guide rather than data.

Token	Default	Paints
`--chart-1`	your theme's	the first series
`--chart-2`	your theme's	the second series
`--chart-foreground-muted`	`--muted-foreground` mixed toward `--background`	skeletons and faded marks
`--chart-background`	`--card`	dot halos, the gaps between stacked marks
`--chart-grid`	`--border`	grid lines
`--chart-label`	`--muted-foreground`	tick labels
`--chart-crosshair`	`--muted-foreground` at 75%	the hover line
`--chart-tooltip-background`	`--popover`	the tooltip panel

globals.css

:root {
  --chart-background: var(--background);
  --chart-grid: var(--muted);
}

Accessibility

Each chart is an image named by ariaLabel ("Error bar chart" or "Ribbon chart" by default). Say what the interval means in the label or in ariaDescription, for example "95% confidence interval", because a screen reader gets no whiskers or bands.

Tab: Moves focus to the chart and its first category, or its first date on a ribbon chart.
Arrow Right: Moves to the next category or date. ArrowDown does the same.
Arrow Left: Moves to the previous one. ArrowUp does the same.
Home: Jumps to the first one.
End: Jumps to the last one.

API reference

Solid takes the same props as React, with class for className. A render prop is a function, called again when its arguments change, so destructured parameters stay current.

ErrorBarChart

PropType

datareadonly Record<string, unknown>[]

The rows, one estimate each, in the order given.

Type: readonly Record<string, unknown>[]

xDataKey?string

The key of each row's category label.

Default: "name"

orientation?"vertical" | "horizontal"

"vertical" stands the intervals up; "horizontal" runs them left to right down a list of categories (a forest plot).

Type: "vertical" | "horizontal"
Default: "vertical"

aspectRatio?string | number

Aspect ratio of the chart, as "width / height" or a number.

Type: string | number
Default: "2 / 1"

margin?Partial<ChartMargin>

Space around the plot in px.

Type: Partial<ChartMargin>

reference?number

A value to mark with a dashed rule across the plot (no effect, a target, a benchmark).

animate?boolean

Animate the intervals in on mount: each grows from its low end to its high end, its estimate following.

Default: true

animationDuration?number

Length of the entrance in milliseconds.

Default: 1100

ariaLabel?string

Accessible name of the chart.

Default: "Error bar chart"

ariaDescription?string

Longer accessible description of the chart.

class?string

Extra class name for the chart container.

style?CSSProperties

Inline styles for the chart container.

children?ReactNode

The chart's parts: ErrorBar, Grid, BarXAxis, BarYAxis and ChartTooltip.

status?ChartStatus

"loading" draws a shimmering skeleton shaped like the chart in place of its marks and ignores the pointer; switching to "ready" plays the chart's entrance.

Default: "ready"

loadingLabel?string

Centered label shown over the plot while status is "loading".

ErrorBar

PropType

dataKeystring

The key of each row's estimate.

lowKeystring

The key of each row's low bound.

highKeystring

The key of each row's high bound.

label?string

The estimate's name in the tooltip. Defaults to dataKey.

intervalLabel?string

The interval's name in the tooltip, for example "95% CI".

Default: "Range"

color?string

Colour of the intervals and estimates. A row's own color field wins.

Default: "var(--chart-1)"

showCaps?boolean

Draw a cap across each end of the interval.

Default: true

capWidth?number

Width of a cap in px.

Default: 14

strokeWidth?number

Width of the interval's line in px.

Default: 2

radius?number

Radius of the estimate's dot in px.

Default: 5

formatValue?(value: number) => string

Formats a value in the tooltip and on the value axis. Defaults to a grouped number.

Type: (value: number) => string

fadedOpacity?number

Opacity of the other rows while one is hovered.

Default: 0.3

RibbonChart

PropType

datareadonly Record<string, unknown>[]

The rows, one per time, oldest first: each holds its date under xDataKey and the bounds the Ribbons and RibbonLine read.

Type: readonly Record<string, unknown>[]

xDataKey?string

The key of each row's date (a Date, an ISO string or epoch milliseconds).

Default: "date"

aspectRatio?string | number

Aspect ratio of the chart, as "width / height" or a number.

Type: string | number
Default: "2 / 1"

margin?Partial<ChartMargin>

Space around the plot in px.

Type: Partial<ChartMargin>

animate?boolean

Animate the ribbons and the line in on mount.

Default: true

animationDuration?number

Length of the entrance in milliseconds.

Default: 1100

ariaLabel?string

Accessible name of the chart.

Default: "Ribbon chart"

ariaDescription?string

Longer accessible description of the chart.

class?string

Extra class name for the chart container.

style?CSSProperties

Inline styles for the chart container.

children?ReactNode

The chart's parts: Ribbons (widest first), RibbonLines, Grid, XAxis, YAxis and ChartTooltip.

status?ChartStatus

"loading" draws a shimmering skeleton shaped like the chart in place of its marks and ignores the pointer; switching to "ready" plays the chart's entrance.

Default: "ready"

loadingLabel?string

Centered label shown over the plot while status is "loading".

Ribbon

PropType

lowKeystring

The key of each row's low bound.

highKeystring

The key of each row's high bound.

label?string

The band's name in the tooltip, for example "10th–90th percentile". Defaults to lowKey–highKey.

fill?string

Colour of the band.

Default: "var(--chart-1)"

fillOpacity?number

Opacity of the band's fill. Nested bands read best widest-faintest.

Default: 0.2

RibbonLine

PropType

dataKeystring

The key of each row's value.

label?string

The line's name in the tooltip. Defaults to dataKey.

stroke?string

Colour of the line.

Default: "var(--chart-1)"

strokeWidth?number

Width of the line in px.

Default: 2

strokeDasharray?string

Dash pattern of the line, for example "4 4" for a forecast.

formatValue?(value: number) => string

Formats a value in the tooltip and on the value axis. Defaults to a grouped number.

Type: (value: number) => string

Grid

PropType

horizontal?boolean

Show horizontal grid lines.

Default: true

vertical?boolean

Show vertical grid lines.

Default: false

numTicksRows?number

Number of horizontal grid lines. Ignored when rowTickValues is set.

Default: 5

numTicksColumns?number

Number of vertical grid lines.

Default: 10

rowTickValues?number[]

Explicit y values for the horizontal grid lines. Overrides numTicksRows.

stroke?string

Color of the grid lines.

Default: "var(--chart-grid)"

loadingStroke?string

Grid color while the chart is loading. Falls back to stroke.

strokeOpacity?number

Opacity of the grid lines.

Default: 1

strokeWidth?number

Width of the grid lines in px.

Default: 1

strokeDasharray?string

Dash pattern of the grid lines.

Default: "4,4"

highlightRowValues?number[]

Y values of horizontal lines drawn with the highlight styling, for example a zero baseline.

highlightRowStroke?string

Color of the highlighted rows.

Default: "var(--chart-foreground-muted)"

highlightRowStrokeOpacity?number

Opacity of the highlighted rows.

Default: 1

highlightRowStrokeWidth?number

Width of the highlighted rows in px.

Default: 1

highlightRowStrokeDasharray?string

Dash pattern of the highlighted rows.

Default: "0"

fadeHorizontal?boolean

Fade the horizontal lines toward transparent at the left and right edges.

Default: true

fadeVertical?boolean

Fade the vertical lines toward transparent at the top and bottom edges.

Default: false

hideHorizontalEdgeLines?boolean

Drop the first and last horizontal line (kept when two or fewer remain).

Default: false

hideVerticalEdgeLines?boolean

Drop the first and last vertical line (kept when two or fewer remain).

Default: false

shimmer?boolean

While the chart is loading, sweep a bright band across the grid.

Default: false

shimmerStroke?string

Color of the shimmer band.

Default: "color-mix(in oklch, var(--bkm-foreground) 68%, transparent)"

shimmerSpeed?number

Speed multiplier of the shimmer sweep. 2 is twice as fast.

Default: 1

BarXAxis

PropType

tickerHalfWidth?number

Half-width in px of the zone around the date pill inside which tick labels are hidden.

Default: 50

showAllLabels?boolean

Show every category label, even where they overlap, instead of thinning them to maxLabels and to the plot width.

Default: false

maxLabels?BarLabelCount

Maximum number of category labels when showAllLabels is off. Fewer are shown, evenly spaced, when that many would not fit the plot width. Pass { base, sm, md, lg, xl } to vary it with the chart's width (640, 768, 1024 and 1280 px and up).

Default: 12

BarYAxis

PropType

showAllLabels?boolean

Horizontal charts: show every category label instead of thinning to maxLabels.

Default: true

maxLabels?number

Horizontal charts: maximum number of category labels when showAllLabels is off.

Default: 20

numTicks?number

Vertical charts: target number of value ticks. Grid settings take precedence.

Default: 5

formatLargeNumbers?boolean

Vertical charts: abbreviate values of 1000 and above as thousands, for example 2k.

Default: true

formatValue?(value: number) => string

Vertical charts: formats a value tick into its label. Overrides formatLargeNumbers.

Type: (value: number) => string

XAxis

PropType

numTicks?number | ResponsiveChartLabelCount

Target number of tick labels along the x axis, or one per chart width: { base, sm, md, lg, xl } takes the count of the widest breakpoint the chart reaches (640, 768, 1024 and 1280 px).

Type: number | ResponsiveChartLabelCount
Default: 5

labels?readonly string[]

The tick text of each data row, in row order: it replaces the date formatting (pair it with ChartTooltip dateLabels).

tickerHalfWidth?number

Half-width in px of the zone around the date pill inside which tick labels are hidden. Line, area and composed charts widen it to the pill's half-width plus the widest tick label's, so no label sits half under the pill.

Default: 50

tickMode?"domain" | "data"

Where ticks fall: "data" places them on evenly spaced data rows, "domain" places them at evenly spaced time values across the x domain.

Type: "domain" | "data"
Default: "data"

formatValue?(value: Readonly<Date>) => string

Formats a tick date into its label. Defaults to a short month and day such as "Jan 5".

Type: (value: Readonly<Date>) => string

YAxis

PropType

yAxisId?string | number

Id of the y scale this axis labels. Must match the yAxisId of the series that use it.

Type: string | number
Default: "left"

orientation?"left" | "right"

Side of the plot the axis sits on. The primary axis is on the left; additional axes default to the right.

Type: "left" | "right"
Default: "left"

numTicks?number

Target number of tick labels. The primary axis also sets the number of horizontal grid lines.

Default: 5

formatLargeNumbers?boolean

Abbreviate values of 1000 and above as thousands, with one decimal where needed, for example 2k or 1.5k.

Default: true

formatValue?(value: number) => string

Formats a tick value into its label. Overrides formatLargeNumbers.

Type: (value: number) => string

ChartTooltip

PropType

showDatePill?boolean

Show the date pill that rides along the bottom of the plot.

Default: true

showCrosshair?boolean

Show the vertical crosshair line. Bar charts leave it off unless this is true (the dots and the category pill mark the bar).

Default: true

showDots?boolean

Show a dot on every series at the hovered position.

Default: true

dotVariant?"dot" | "ring"

Dot style: a filled "dot" or a transparent "ring" square. Read by BarChart only.

Type: "dot" | "ring"
Default: "dot"

dotSize?number

Dot radius in px.

Default: 5

dotRadiusFraction?number

Corner radius of the "ring" variant as a fraction of its side (0 is square, 0.5 is a circle). Read by BarChart only.

Default: 0.25

dotScale?number

Multiplier applied to the dot or ring size. Read by BarChart and LiveLineChart.

Default: 1

dotStrokeWidth?number

Stroke width of the dots in px.

Default: 2

indicatorColor?string | ((point: Record<string, unknown>) => string)

Color of the crosshair. Only a string is applied; the function form that bklit-ui accepts is ignored and the default is used.

Type: string | ((point: Record<string, unknown>) => string)
Default: "var(--chart-crosshair)"

content?(props: { point: Record<string, unknown>; index: number; pinned?: boolean; dismiss?: () => void }) => ReactNode

Replaces the default tooltip panel body. Receives the hovered data row and its index; with pinnable, also whether the panel is pinned and a dismiss that unpins it (for a close button in a pinned panel's detail).

Type: (props: { point: Record<string, unknown>; index: number; pinned?: boolean; dismiss?: () => void }) => ReactNode

pinnable?boolean

A click (or Enter, or Space) on the chart pins the tooltip where it is: the panel takes the pointer, so its content can grow into detail and hold controls, until another click, Escape or dismiss lets it go.

Default: false

rows?(point: Record<string, unknown>) => { readonly color: string; readonly label: string; readonly value: string | number }[]

Replaces the default rows (one per series) with your own list of { color, label, value }.

Type: (point: Record<string, unknown>) => { readonly color: string; readonly label: string; readonly value: string | number }[]

dotColor?string | ((point: Record<string, unknown>, line: ChartLineConfig) => string)

Fill of the tooltip dots. A function receives the hovered row and the series config, and is called again each time the hovered row changes. Defaults to each series' color; a ProfitLossLine's dot takes the color of the hovered value's sign.

Type: string | ((point: Record<string, unknown>, line: ChartLineConfig) => string)

children?ReactNode

Extra content rendered below the rows in the default panel, for example marker details. Without it, a chart with ChartMarkers lists the markers on the hovered date there.

class?string

Extra class name for the tooltip panel.

springConfig?SpringConfig

Spring for the floating panel when matchCrosshair is on. Defaults to the chart's tooltip spring.

matchCrosshair?boolean

Make the floating panel follow the pointer with the same spring as the crosshair instead of damping.

Default: false

damping?number

Spring damping for the floating panel when matchCrosshair is off, on bklit's 0 to 100 scale: lower is bouncier, higher slower, 0 moves the panel instantly. The default, 20, is the snappy hover spring (stiffness 3600, damping 120); every other value is bklit's spring for it played six times faster.

Default: 20

indicatorDasharray?string

Dash pattern of the crosshair. Omit for a solid line.

indicatorFadeEdges?IndicatorFadeEdges

Vertical fade of the crosshair: both ends, the top, the bottom, or none (solid).

Default: "both"

indicatorFadeLength?number

Size of the crosshair's fade, as a percentage of its height (2 to 40).

Default: 10

indicatorEndColor?string

Bottom colour of the crosshair: it ramps from indicatorColor at the top to this at the bottom (composes with the fade).

indicatorEnd?"plot" | "point"

How far down the crosshair reaches: the whole plot, or down to the hovered point of the first series.

Type: "plot" | "point"
Default: "plot"

dotHaloBlur?number

Blur in px on the dots' halo, for a soft glow.

Default: 0

topOffset?number

Extra gap in px between the top of the plot and the tooltip panel.

Default: 0

dateLabels?readonly string[]

The date pill's text for each data row, in row order (pair it with XAxis labels).

boxSpringConfig?SpringConfig

Spring for the floating panel. Takes priority over matchCrosshair and damping.

indicatorWidth?IndicatorWidth

Thickness of the crosshair: a width in px, or "line" (1px), "thin" (2px), "medium" (4px) or "thick" (8px).

Default: "line"

ErrorBarChartLoading

PropType

margin?Partial<ChartMargin>

Space around the plot in px. Missing sides use the chart's default.

Type: Partial<ChartMargin>

aspectRatio?string | number

Aspect ratio of the placeholder, as "width / height" or a number.

Type: string | number
Default: the chart's

label?string

Text shown centered over the skeleton, with a shimmer. Nothing is shown when it is unset or empty.

loadingLabel?string

Deprecated: Use label, the name every chart's placeholder takes..

class?string

Extra class name for the chart container.

RibbonChartLoading

PropType

margin?Partial<ChartMargin>

Space around the plot in px. Missing sides use the chart's default.

Type: Partial<ChartMargin>

aspectRatio?string | number

Aspect ratio of the placeholder, as "width / height" or a number.

Type: string | number
Default: the chart's

label?string

Text shown centered over the skeleton, with a shimmer. Nothing is shown when it is unset or empty.

loadingLabel?string

Deprecated: Use label, the name every chart's placeholder takes..

class?string

Extra class name for the chart container.

Examples

5 examples on Solid, each live with its code and its own install command.

All 5 uncertainty chart examples

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Preview

Installation

Usage

Anatomy

Forest plots

Ribbons over time

Forecasts

Customization

Loading state

Animation

Theming

Accessibility

API reference

ErrorBarChart

ErrorBar

RibbonChart

Ribbon

RibbonLine

Grid

BarXAxis

BarYAxis

XAxis

YAxis

ChartTooltip

ErrorBarChartLoading

RibbonChartLoading

Examples