Myndex/SAPC-APCA
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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.
6 mentions on Hacker News by 6 people: 1 story, 5 comments · first 2021-12-09 · latest 2025-07-23
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…or eye strain. Doesn't APCA advocate a maximum contrast? Best link I could find right now is https://github.com/Myndex/SAPC-APCA/discussions/106 but it lacks explanation. If it doesn't account for the above, any ideas what APCA means by…
comment by seanwilson · 2025-07-23 · in My Color Combo Passes WCAG – So Why Does It Still Hurt to Look At? -
…proactively seek out comments like these as there are too few at the official APCA discussion forum https://github.com/Myndex/SAPC-APCA/discussions That said: A px is not a device pixel, it is referenced to the canvas abstraction layer as…
comment by Myndex · 2023-09-05 · in Accessible Palette: stop using HSL for color systems (2021) -
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Why the New Contrast Method APCAstory by matthews2 · 2022-06-12 · 1 comment
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…(APCA), which is the one used in the WCAG 3 working spec. It more accurately accounts for hue: https://github.com/Myndex/SAPC-APCA
comment by jjcm · 2022-05-20 · in Change the colour of grey text back to black on website using poor contrast text -
…much of this is copyrightable at all and to what extent these terms are just sowing legal FUD.) [1] https://github.com/Myndex/SAPC-APCA/ [2] https://www.myndex.com/CVD/ [3] https://github.com/Myndex/apca-w3/ [4]…
comment by mananaysiempre · 2022-05-18 · in Please Stop Using Grey Text -
This is long overdue, thank you so much! Direct link [0] https://github.com/Myndex/SAPC-APCA
comment by java-man · 2021-12-09 · in WCAG 3 will use a new color contrast method called APCA