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APCA (Accessible Perceptual Contrast Algorithm) is a new method for predicting contrast for use in emerging web standards (WCAG 3) for determining readability contrast. APCA is derived form the SAPC (S-LUV Advanced Predictive Color) which is an accessibility-oriented color appearance model designed for self-illuminated displays.
Lexica Ultralegible builds on the foundation laid by Atkinson Hyperlegible but offers enhanced flexibility and usability across various applications. Including more glyphs supporting extra languages and additional typographic features like ligatures and alternative flipped zero.