Heartbeat
Registry ID
GCR-2025-AA0000
Issued December 7, 2025
Color data
HEX #AA0000
RGB 170 / 0 / 0
HSL 0° / 100% / 33%
CMYK 0 / 100 / 100 / 33
opencolors.org/certificate/AA0000
The registry ID is GCR, the year the color was named, and its hex.
Registry ID
GCR-2025-AA0000
Issued December 7, 2025
Color data
HEX #AA0000
RGB 170 / 0 / 0
HSL 0° / 100% / 33%
CMYK 0 / 100 / 100 / 33
opencolors.org/certificate/AA0000
White text
7.75:1 · AAA
Black text
2.71:1 · Fail
CSS
--heartbeat: #AA0000;
Tailwind
bg-[#AA0000]
Token
{
"heartbeat": {
"value": "#AA0000"
}
}