#5999DC
Closest named color: Cornflower Blue (#6495ED). oklch(66.9% 0.12 251), rgb(89, 153, 220).
Aa
Black text reads best on this color (7.01:1).
About this color
#5999DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.120 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.032 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #5999DC |
| RGB | rgb(89, 153, 220) |
| HSL | hsl(211, 65%, 61%) |
| OKLCH | oklch(66.9% 0.12 251) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #5999DC | 2.99:1 | Fails | Lc -61.7 | Content text, not long reading |
| Black text on #5999DC | 7.01:1 | AAA | Lc 47.7 | Large or bold text, headings |
| #5999DC text on white | 2.99:1 | Fails | Lc 56.4 | Large or bold text, headings |
| #5999DC text on black | 7.01:1 | AAA | Lc -45.4 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEF
oklch(88.5% 0.033 252.5)
-
Step 300
300
#A5C4E6
oklch(80.9% 0.059 250.9)
-
Step 400
400
#74A5DA
oklch(70.8% 0.094 251.1)
-
Step 500
500 (this color)
#5999DC
oklch(66.9% 0.12 251)
-
Step 600
600
#2E76BC
oklch(55.6% 0.13 250.9)
-
Step 700
700
#2063A2
oklch(49.1% 0.121 250.7)
-
Step 800
800
#1D5184
oklch(42.7% 0.101 251.1)
-
Step 900
900
#1E436A
oklch(37.6% 0.079 251.8)
-
Step 950
950
#13283E
oklch(27.1% 0.049 251.1)
#5999DC with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #7D9CDF | 0.041 |
| Deuteranopia (no green cones) | #6B8FDB | 0.030 |
| Tritanopia (no blue cones) | #00A9B1 | 0.099 |
| Achromatopsia (no color) | #959595 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5999DC
#5999DC
oklch(66.9% 0.12 251)
- #C38736
#C38736
oklch(66.9% 0.12 70.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #5999DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.041
- Faded Blue #658CBB ΔE 0.053
- Soft Blue #6488EA ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.072
- Perrywinkle #8F8CE7 ΔE 0.073
- Greyblue #77A1B5 ΔE 0.075
Use #5999DC in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.