Inspect DeepSkyBlue (#00BFFF) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
DeepSkyBlue
#00BFFF
Black text reads best on this background, at 9.9:1.
DeepSkyBlue is one of the 148 CSS named colors, and resolves to #00BFFF in every browser. In numbers that is rgb(0, 191, 255) and hsl(195, 100%, 50%). Perceptually it is a light, moderately saturated color: OKLCH puts its lightness at 76% and its chroma at 0.153. It sits in the blues at 232 degrees of OKLCH hue, and reads as a cool color.
White text only reaches 2.12:1 here, so black text is the safer pairing at 9.9:1. That combination of lightness and chroma makes it a workable mid-tone, the kind of value that lands in the middle of a shade scale.
The closest CSS named colors to DeepSkyBlue, measured with CIEDE2000, are LightSkyBlue (#87CEFA), SkyBlue (#87CEEB), LightBlue (#ADD8E6). If DeepSkyBlue is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#00BFFF
RGB
rgb(0, 191, 255)
HSL
hsl(195, 100%, 50%)
HWB
hwb(195 0% 0%)
CMYK
cmyk(100%, 25%, 0%, 0%)
LAB
lab(71.83 -24.07 -43.56)
LCH
lch(71.83 49.76 241.07)
OKLCH
oklch(75.54% 0.1534 231.64)
WCAG asks for 4.5:1 between body text and its background. On #00BFFF white text measures 2.12:1 and black text 9.9:1, so black clears it and white does not.
White text on DeepSkyBlue
WCAG 2.2
2.12:1
APCA
Lc 45
Fails AA body text
Fails AAA body text
Fails AA large text
Black text on DeepSkyBlue
WCAG 2.2
9.9:1
APCA
Lc 63
Passes AA body text
Passes AAA body text
Passes AA large text
Check DeepSkyBlue against any other color in the contrast checker.
DeepSkyBlue sits at 76% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #F1FAFF and down to #00070D, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#5FCCFF
20% lighter
#8BD8FF
40% lighter
#AFE3FF
60% lighter
#D1EFFF
80% lighter
#F1FAFF
100% lighter
#0095C8
20% darker
#006D93
40% darker
#004762
60% darker
#002535
80% darker
#00070D
100% darker
Build a full accessible scale from #00BFFF in the shade generator.
Hues rotated around #00BFFF 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.
DeepSkyBlue sits at 232 degrees. Rotating it a half turn lands on 52 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 DeepSkyBlue at 202 and 262 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
232, 352 and 112 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 52 degrees, this pair flanks it at 22 and 82. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around DeepSkyBlue on the color wheel.
The biggest shift is under achromatopsia, where #00BFFF reads as #9B9B9B, 23.9 CIEDE2000 units away. If DeepSkyBlue is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#95AFFF
Deuteranopia
#6A8DFF
Tritanopia
#00D7D2
Achromatopsia
#9B9B9B
The nearest CSS keywords to #00BFFF, ranked by perceptual distance rather than by how close their hex digits happen to look.