Inspect Purple (#800080) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
Purple
#800080
White text reads best on this background, at 9.42:1.
Purple is one of the 148 CSS named colors, and resolves to #800080 in every browser. In numbers that is rgb(128, 0, 128) and hsl(300, 100%, 25%). Perceptually it is a dark, vivid color: OKLCH puts its lightness at 42% and its chroma at 0.193. It sits in the pinks at 328 degrees of OKLCH hue, and reads as a cool color.
White text clears WCAG AA on a Purple background at 9.42:1, and AAA as well. At this chroma it is loud enough to be an accent or a call to action, but it will fight anything else vivid placed next to it.
The closest CSS named colors to Purple, measured with CIEDE2000, are DarkMagenta (#8B008B), RebeccaPurple (#663399), Indigo (#4B0082). If Purple is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#800080
RGB
rgb(128, 0, 128)
HSL
hsl(300, 100%, 25%)
HWB
hwb(300 0% 50%)
CMYK
cmyk(0%, 100%, 0%, 50%)
LAB
lab(29.69 56.11 -36.29)
LCH
lch(29.69 66.83 327.11)
OKLCH
oklch(42.09% 0.1935 328.36)
WCAG asks for 4.5:1 between body text and its background. On #800080 white text measures 9.42:1 and black text 2.23:1, so white clears it and black does not.
White text on Purple
WCAG 2.2
9.42:1
APCA
Lc 94
Passes AA body text
Passes AAA body text
Passes AA large text
Black text on Purple
WCAG 2.2
2.23:1
APCA
Lc 14
Fails AA body text
Fails AAA body text
Fails AA large text
Check Purple against any other color in the contrast checker.
Purple sits at 42% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #FFF5FE and down to #100010, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#A434A3
20% lighter
#CA59C7
40% lighter
#F07DEC
60% lighter
#FFB7FB
80% lighter
#FFF5FE
100% lighter
#670067
20% darker
#4F004F
40% darker
#380038
60% darker
#230023
80% darker
#100010
100% darker
Build a full accessible scale from #800080 in the shade generator.
Hues rotated around #800080 in OKLCH, then pulled back into the sRGB gamut. Each swatch is labelled with the nearest CSS named color so you have a keyword to start from.
Purple sits at 328 degrees. Rotating it a half turn lands on 148 degrees, the hue directly opposite. It is the strongest pairing you can make without changing lightness, and the one most likely to vibrate if you use both at full chroma.
The neighbors of Purple at 298 and 358 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
328, 88 and 208 degrees divide the wheel into thirds. Balanced enough to carry a whole palette without one color dominating the other two.
Instead of the complement at 148 degrees, this pair flanks it at 118 and 178. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around Purple on the color wheel.
The biggest shift is under achromatopsia, where #800080 reads as #252425, 28.8 CIEDE2000 units away. If Purple is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#001B86
Deuteranopia
#122A7B
Tritanopia
#8A0928
Achromatopsia
#252425
The nearest CSS keywords to #800080, ranked by perceptual distance rather than by how close their hex digits happen to look.