Summary

APCA reports contrast values (Lc ranging from 0 to 106 for dark text on light backgrounds and -108 to 0 for light text on dark backgrounds/dark mode). These values are perceptually consistent, meaning an Lc of 60 always represents the same perceived readability contrast, regardless of the color intensity.

Title

APCA Contrast Calculator

Description

APCA Contrast Calculator

Keywords

contrast, text, font, color, weight, value, size, minimum, background, reference, dark, fonts, target, light, level, body, readability

NS Lookup

A 185.199.109.153, A 185.199.111.153, A 185.199.108.153, A 185.199.110.153

Dates

Created 2026-03-09

Updated 2026-03-09

Summarized 2026-03-10