React star spoke chart — multivariate profile as spokes of a tiny star. Tiny accessible SVG microchart; RSC-safe static or /interactive.

StarSpoke answers "what is this entity's profile across a few metrics — and which entity in a set is the odd one out?". Spokes radiate from the center and their length encodes each value. There is no connecting polygon, ever: the enclosed area of a radar chart lies about magnitude and axis order, and the research is clear that contour-free wins for spotting outliers.

StarSpoke

interactive · 4.81 kB · static · 2.33 kB

Install

Import & usereact/star-spoke

import { StarSpoke } from "@microcharts/react/star-spoke";// metrics — real values under “Sample data” below<StarSpoke data={metrics} title="Product profile" />

Sample data

const metrics = [  { label: "Speed", value: 0.9 },  { label: "Power", value: 0.6 },  { label: "Range", value: 0.5 },  { label: "Cost", value: 0.3 },  { label: "Ease", value: 0.7 },];

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Try it

When to use it

Good for — entity profiles in small multiples, skill / capability comparison.
Avoid for — fewer than 3 metrics (PairedBars) or precise values (MiniBar).

Sizing

Variants

vs baseline

locale doesn't change any in-chart mark — tip labels are metric names, never formatted numbers — but it does localize the extremes named in the accessible summary:

locale — the accessible summary follows it (no visible mark changes)

Edge cases

long labels at a small size drop out, not overlap

no data

Four homes

Why this default

Contour-free is the point: a connecting polygon is decoration that changes the read, exaggerating area for high-variance profiles and hiding the individual spoke lengths that actually matter for comparison. One shared domain governs every spoke in a glyph — mixed-domain metrics are the caller's normalization to state, so a set of small multiples stays honestly comparable.

Every spoke sits at a fixed clock position (first at 12 o'clock, clockwise), so the axis order never shifts between instances — that fixed order, plus the default-on guide spokes, is what keeps a profile readable even where a metric's label doesn't seat. Tip labels seat at the rim, not the value tip, so a low-value spoke never drags its label into the hub. A label is dropped only when its estimated width exceeds the whole glyph; anything narrower is clamped into the reserved label ring instead, which keeps rim labels at distinct angles rather than dropping them.

Accessibility

The accessible name names the extremes — "5 metrics; highest Speed (0.9), lowest Cost (0.3)." The interactive entry rotates focus through the spokes with ←/→, announcing each metric and value.

The interactive entry follows the shared interaction contract: arrow keys rove between units on both axes, Home and End jump to the ends, and a click, tap, Enter or Space selects a unit — pinning its readout so it survives blur, until you select it again or press Escape. On touch, a tap pins and a drag scrubs.

Props

Prop	Type	Notes
data*	{ label, value }[]	3–8 metrics on a shared domain.
dots	"tips" \| "none"	`"tips"` draws endpoint dots to sharpen the outlier read.
guides	boolean	Full-length guide spokes (read-back scaffold).
compare	number[]	Muted ghost baseline spokes.
labels	boolean	Spoke labels at the tips (default true; drop out below size 44).
size	number	Star box edge in viewBox units (default 80).
animate	boolean	interactiveOpt-in entrance motion when the chart mounts client-side — add `import "@microcharts/react/motion"` once. Inert on the server, on hydrated server HTML, and under `prefers-reduced-motion`.

Plus the shared grammar — data, domain, color, title, summary, format — and the layout props (width, height, className, style) that every chart accepts. Interactive entries also share animate and live, and — wherever a chart has more than one navigable unit — onActive, onSelect, selectedIndex and defaultSelectedIndex; and — wherever the chart shows a hover value — readout. See the shared grammar.