Wolfram Language Paclet Repository

Community-contributed installable additions to the Wolfram Language

Wolfram/ AccessibleColors

WCAG color-contrast and accessibility utilities for the Wolfram Language

Contributed by: Nikolay Murzin, Claude (Anthropic)

The package provides WCAGContrastRatio, WCAGLevel, AccessibleTextColor, and AdjustForContrast.

Installation Instructions

To install this paclet in your Wolfram Language environment, evaluate this code:
PacletInstall["Wolfram/AccessibleColors"]


To load the code after installation, evaluate this code:
Needs["Wolfram`AccessibleColors`"]

Details

AccessibleColors builds on the Wolfram Language color primitives (ColorConvert, Blend) rather than replacing them.
It adds the WCAG accessibility layer: contrast ratios, conformance levels, and contrast-driven color choices.

Paclet Guide

Examples

Basic Examples (4) 

Measure the contrast between two colors:

In[1]:=
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307.0436840057373`], List[153.98200225830078`, 235.99870109558105`], List[195.`, 212.31669425964355`], List[195.`, 22.863691329956055`], List[30.928985595703125`, 117.59068870544434`], List[30.928985595703125`, 307.0436840057373`]], List[List[200.`, 410.42970085144043`], List[364.0710144042969`, 315.7036876678467`], List[241.01799774169922`, 244.65868949890137`], List[200.`, 220.97669792175293`], List[158.98200225830078`, 244.65868949890137`], List[35.928985595703125`, 315.7036876678467`], List[200.`, 410.42970085144043`]], List[List[376.5710144042969`, 320.03370475769043`], List[202.5`, 420.53370475769043`], List[200.95300006866455`, 421.42667961120605`], List[199.04699993133545`, 421.42667961120605`], List[197.5`, 420.53370475769043`], List[23.428985595703125`, 320.03370475769043`], List[21.882003784179688`, 319.1406993865967`], List[20.928985595703125`, 317.4896984100342`], List[20.928985595703125`, 315.7036876678467`], List[20.928985595703125`, 114.70369529724121`], 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Rule[ShowStringCharacters, True]], "Tooltip"]]], Rule[Background, RGBColor[0.968`, 0.976`, 0.984`]], Rule[BaselinePosition, Baseline], Rule[DefaultBaseStyle, List[]], Rule[FrameMargins, List[List[0, 0], List[1, 1]]], Rule[FrameStyle, RGBColor[0.831`, 0.847`, 0.85`]], Rule[RoundingRadius, 4]], PacletSymbol["Wolfram/AccessibleColors", "Wolfram`AccessibleColors`WCAGContrastRatio"], Rule[Selectable, False], Rule[SelectWithContents, True], Rule[BoxID, "PacletSymbolBox"]][Gray, White]
Out[1]=

Grade a pair against the WCAG thresholds:

In[2]:=
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Out[2]=

Repair a color so it clears AA:

In[3]:=
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Out[3]=

Pick legible text for a background:

In[4]:=
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Out[4]=

Scope (2) 

Choose a legible label color across a whole palette at once:

In[5]:=
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Out[5]=

Build a light/dark adaptive text color for a white-then-black background:

In[6]:=
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Out[6]=

Applications (2) 

Track the accessible text color live as a background is dragged:

In[7]:=
DynamicModule[{bg = LightBlue}, Column[{Framed[ Dynamic[Style[ "Sample", InterpretationBox[FrameBox[TagBox[TooltipBox[PaneBox[GridBox[List[List[GraphicsBox[List[Thickness[0.0025`], List[FaceForm[List[RGBColor[0.9607843137254902`, 0.5058823529411764`, 0.19607843137254902`], Opacity[1.`]]], FilledCurveBox[List[List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3]]], List[List[List[205.`, 22.863691329956055`], List[205.`, 212.31669425964355`], List[246.01799774169922`, 235.99870109558105`], List[369.0710144042969`, 307.0436840057373`], List[369.0710144042969`, 117.59068870544434`], 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Style[Defer[PacletSymbol["Wolfram/AccessibleColors", "Wolfram`AccessibleColors`AccessibleTextColor"]], Rule[ShowStringCharacters, True]], "Tooltip"]]], Rule[Background, RGBColor[0.968`, 0.976`, 0.984`]], Rule[BaselinePosition, Baseline], Rule[DefaultBaseStyle, List[]], Rule[FrameMargins, List[List[0, 0], List[1, 1]]], Rule[FrameStyle, RGBColor[0.831`, 0.847`, 0.85`]], Rule[RoundingRadius, 4]], PacletSymbol["Wolfram/AccessibleColors", "Wolfram`AccessibleColors`AccessibleTextColor"], Rule[Selectable, False], Rule[SelectWithContents, True], Rule[BoxID, "PacletSymbolBox"]][bg], 20]], Background -> Dynamic[bg], FrameMargins -> 16], ColorSlider[Dynamic[bg]]}], SaveDefinitions -> True]
Out[7]=

Show each swatch in a palette labeled with the text color and ratio the package picks:

In[8]:=
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Out[8]=

Compatibility

Wolfram Language Version 14.0

Version History

  • 1.1.0 – 26 May 2026
  • 1.0.0 – 22 May 2026

License Information

MIT License

Paclet Source

Source Metadata

  • Citation: Web Content Accessibility Guidelines (WCAG) 2.1. W3C Recommendation, 5 June 2018