TOOL / EXPERIMENTAL PUBLIC ALPHA

Evidence, given a
disciplined visual voice.

Scientific figures in Python and the browser. Line figures keep color + marker identity, with optional direct labels.

Published a4 / alpha.5.

Six examples from the published registry packages. Deterministic synthetic data, not scientific findings. Open PNGs or SVGs at native size.

Lavender line figure: three separated synthetic response curves with matching circle, square and triangle legend samples. — Line · Python a4
Three named series, 25 observations each. Open circles, squares and triangles carry identity; every line is solid.
Open SVG

Dark Ultraviolet Canvas line figure showing the same three synthetic responses with matching circle, square and triangle identities. — Line · browser alpha.5
The same values rendered independently in Ultraviolet Laboratory. Settled Canvas, with an SVG export alongside it.
Open SVG

Two synthetic calibration groups, ten points each, rise with input; group A is purple and B teal, with no fitted line. — Scatter · Python a4
Ten paired observations per group; no fitted model. Color identifies A and B; the marker treatment is the published scatter default.
Open SVG

Overlaid distributions in shared bins, with purple and teal dataset-owned vertical median rules and a matching median legend. — Histogram · Python a4
Shared bins cover all 15 observations per dataset. Vertical rules mark full-data medians: A 0.7, B 1.3.
Open SVG

Three groups of nine synthetic observations with median bars, jittered horizontally; count labels remain above their points inside the axes. — Strip summary · Python a4
Nine observations per group, deterministic jitter and group medians. The authored [0,2] domain leaves space for a4 count labels inside the plot.
Open SVG

A four-row, six-column synthetic response field, light to dark purple as values increase, with labeled conditions, samples and colorbar. — Heatmap · Python a4
Four conditions by six samples. Sequential fill encodes response (a.u.) from 0.05 to 1.0, with a colorbar.
Open SVG

Run these examples · Exact data · Package, source and image hashes

Python uses Lavender Fog Notebook; Canvas uses Ultraviolet Laboratory. These renders exclude unreleased layout, safe-save and browser band changes. Page reductions do not establish readability or accessibility qualification. Shared semantics do not imply identical pixels or renderer coverage.

Retained a2 / alpha.3 specimens

Retained alpha.3 Lavender Python line figure: Control uses open circles, Treatment open squares, Model upright triangles, with matching line and marker legend samples — RETAINED ALPHA.3 SPECIMEN / LAVENDER / PYTHON 0.9.0a2 / ORDINARY LEGEND
Retained alpha.3 published-package specimen. Current package identities are shown above; these pixels remain bound to the release that produced them. Select the light Python or dark Canvas specimen for native-size inspection. The converging observations remain close.
PALETTE PINNED INDEPENDENTLY

CURRENT ALPHA / WHAT CHANGEDRelease notes ↗

Current alpha.5.
Maintenance release.

Browser maintenance. Standalone SVG exports retain the intended font stack and authored subtitles within the documented header policy. Sparse numeric arrays reject before rendering or controller mutation; browser observations remain dense and finite.
Python maintenance. Direct-label ownership retires after axes clearing or reuse, categorical-matrix colorbars preserve representable authored domains, and line/heading rendering works at the declared dependency minimums. These are bounded repairs, not expanded renderer coverage.
Stable bounded identity. The a2/alpha.3 foundation remains: S1/S2/S3 circle, square, and upright triangle, optional direct labels, and the bounded light/dark reference pair. Python series_slots carries marker/color identity; supported browser setData updates retain registered keyed identity. Additional-series fallback is deterministic but unqualified; non-solid rhythm is authored meaning, not automatic identity redundancy.

Compare optional direct labels — same data and marker identities

These retained alpha.3 images show the baseline direct-label treatment and were not regenerated for later releases. Each image below pairs with the ordinary-legend specimen above at unchanged native dimensions: Python 1008 × 624; Canvas 760 × 520, DPR 1. Labels separate the names, not coincident or close observations. These are product examples, not new reference-theme qualification.

Lavender Fog Notebook / Python: the same synthetic series with circle, square and upright-triangle identities copied beside their direct labels — Lavender Fog Notebook / Python
Retained alpha.3 specimen · optional direct labels · unchanged data and output size · click for native size.

Ultraviolet Laboratory / Canvas: the same synthetic series with circle, square and upright-triangle identities copied beside their direct labels — Ultraviolet Laboratory / Canvas
Retained alpha.3 specimen · optional direct labels · unchanged data and output size · click for native size.

Specimen versions, data and image hashes · Run the public example

01 / THE CONTRACT

A shared vocabulary,
not shared pixels.

Plot specification, theme, profile, and portable schema travel together. Python and browser surfaces interpret that contract through separate implementations.

Plot specification

Data, encodings, labels, panels, and annotations stay explicit and inspectable.

Theme

Semantic color and surface tokens form each named visual system.

Profile

Typography, markers, grids, and emphasis can change without rewriting the evidence.

Portable schema

Schema 0.4 and renderer API 1 make runtime expectations visible rather than implicit.

02 / THE REFERENCE PROFILE

Three identities.
Two reference themes.

S1 carries an open circle, S2 an open square, and S3 an open upright triangle. Default lines are solid and equal in semantic weight. Color + shape carry identity; line rhythm remains available for independent scientific semantics. Matching line + marker legends teach the same identity drawn in the body; optional direct labels reuse it beside the traces.

Lavender Fog Notebook

Reference light theme for the documented three-series line profile. The retained alpha.3 Python specimen above shows its ordinary legend and optional direct-label treatment at 1008 × 624.

Open retained alpha.3 Python specimen ↗

Ultraviolet Laboratory

Reference dark theme for the same bounded profile. The retained alpha.3 terminal-Canvas specimen shows its ordinary legend and optional direct-label treatment at 760 × 520, DPR 1.

Open retained alpha.3 Canvas specimen ↗

Reference means an evidence-backed exemplar under documented rendering conditions, not universal qualification or a change in default theme selection. Close and overlapping observations may remain difficult to distinguish.

Read the bounded reference profile

03 / THE RUNTIMES

Two first successes.
One explicit boundary.

The shared vocabulary does not promise identical coverage. Python includes the categorical-matrix extension; the browser root currently covers line, scatter, and strip summary, with temporal renderers in a separate extension.

PYTHON / MINIMAL RUNNABLE

From arrays to a saved figure.

figurestead==0.9.0a4

from figurestead import line

figure, axes = line([0, 1, 2], [[0, 1, 0]])
figure.savefig("figurestead-first-success.png", dpi=150)

Open the exact complete example

BROWSER / EXCERPT

A complete contract enters Canvas.

@figurestead/web@0.9.0-alpha.5

import { createFigurestead } from "@figurestead/web";

const figure = createFigurestead(canvas, contract, {
  autoplay: false,
  reducedMotion: true,
});
figure.resize();

This excerpt assumes canvas and a complete normalized contract are already defined.

Open the complete browser example

04 / THE EVIDENCE

Inspection includes
the limits.

Version-bound examples, explicit rendering facts, and bounded contracts make the alpha inspectable. The showcase is a deterministic synthetic fixture, not a scientific finding or a new qualification result.

Retained alpha.3 specimen provenance

Producing a2/alpha.3 package versions and hashes, the deterministic 29-observation trajectories, Python/Canvas runtime facts, and all four exact PNG hashes. Each ordinary/direct pair preserves its inputs and output dimensions.

Inspect the specimen manifest ↗

Bounded reference-theme evidence

Recorded normal-color and grayscale inspection at declared sizes supports the documented three-series profile. The retained showcase does not extend that designation to arbitrary densities, overrides or viewing sizes.

Read reference scope and limits ↗

Rendered-series contrast

An explicit single-layer rendered-context audit uses the supplied substrate, opacity and compositing facts. It is distinct from static palette inspection and is not a whole-figure visibility guarantee.

Inspect the rendered-context audit ↗

Direct-label contract

Python direct_labels=True and browser style.directLabels: true opt into the one-panel, 2–3-series treatment with single-line printable ASCII labels. It reuses actual marker identity. Unsupported text, geometry or insufficient fit returns the complete ordinary legend; active browser transitions use ordinary treatment until settled.

Read the supported treatment ↗Compare the public example ↗

Published a4 / alpha.5.

Line · Python a4

Line · browser alpha.5

Scatter · Python a4

Histogram · Python a4

Strip summary · Python a4

Heatmap · Python a4