Upcoming Tool · In Development

WCAG Color Contrast & APCA Accessibility Checker

Check foreground and background color combinations against WCAG 2.1 AA/AAA ratios and modern APCA perceptual contrast algorithms.

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Diagnostic Blueprint

What This Tool Will Analyze & Score

Engineered according to UI Pirate agency standards for high-performing digital products.

01

WCAG 2.1 AA Ratio (4.5:1)

Validates minimum contrast ratio for normal text and interactive form inputs.

Audit Parameter0–100 Weighted
02

WCAG 2.1 AAA Ratio (7:1)

Tests enhanced accessibility benchmarks for enterprise compliance and high-legibility UI.

Audit Parameter0–100 Weighted
03

APCA Perceptual Lightness (Lc)

Calculates modern context-sensitive contrast based on font weight and spatial frequency.

Audit Parameter0–100 Weighted
04

Color Blindness Simulation

Simulates Protanopia, Deuteranopia, and Tritanopia to ensure accessible visual state indicators.

Audit Parameter0–100 Weighted
Evaluation Methodology

How the Diagnostic Engine Works

01. Color Input

HEX, RGB, or HSL

Input your brand colors or import full Tailwind / Figma color palettes.

02. Multi-Standard Verification

Real-Time Contrast Math

Calculates standard luminance ratios and perceptual APCA scores simultaneously.

03. 1-Click Code Export

Accessible Design Tokens

Export validated color combinations directly into Tailwind CSS or CSS Custom Properties.

Agency Service: Design Systems & Frontend Architecture

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Technical Questions

Frequently Asked Questions

What is the difference between WCAG 2.1 and APCA?

WCAG 2.1 uses a simple mathematical luminance ratio, whereas APCA accounts for human vision physiology, font sizes, and weight.

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