WCAG 3.0 APCA Contrast Checker

Evaluate color contrast for digital products utilizing the Advanced Perceptual Contrast Algorithm (APCA) designated for WCAG 3.0.

Configure Colors

Text Color

Background Color

Standard Templates

APCA Contrast

Lc 0Dark on Light

APCA Accessibility Guidelines

Small Body Text (Lc 75+) Fail

Regular Text (Lc 60+) Fail

Large Headings (Lc 45+) Fail

Non-Content Labels (Lc 30+) Fail

Live Preview Rendering

Large Headline (36px Extrabold) — Lc 0

The quick brown fox jumps over the lazy dog.

Subheading (20px Semibold) — Lc 0

Modern typography standards call for perceptual color measurements.

Body Text (15px Regular) — Lc 0

APCA differs from standard WCAG 2.0 formulas by accounting for display characteristics, font weight, background luminance, and spatial frequency. This ensures that text remains readable in both dark and light modes.

Online Web Utility

About apca contrast free

Check typographic color contrast ratios using the modern APCA algorithm designated for WCAG 3.0. Fast, accurate, and private browser-based tool providing instant calculation, formatting, and document generation without installations or paywalls.

How to Use This Tool in 3 Easy Steps

Input Information

Enter your values, select options, or paste data into the tool interface.

Instant Execution

Calculations, formatting, and evaluations compute in real time as you type.

Copy or Download

Export the clean output, copy formatted code, or download printable files.

Why Users Choose SolveMyPDF

✓100% Client-Side Processing: All logic executes locally in your browser with zero latency and complete privacy.
✓No Signups or Paywalls: Full access to all utility features without account creation or payment information.
✓Cross-Platform Compatible: Works seamlessly across desktop, tablet, and mobile browsers on Windows, Mac, iOS, and Android.
✓Accurate & Verified Formulas: Built strictly to official specifications, standards, and mathematical models.