#5B99CE
Closest named color: Faded Blue (#658CBB). oklch(66.3% 0.102 245.9), rgb(91, 153, 206).
Aa
Black text reads best on this color (6.89:1).
About this color
#5B99CE is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.102 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.040 away. Black text reads best on it, at 6.89:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.89:1 |
| White text | 3.04:1 |
Values
| HEX | #5B99CE |
| RGB | rgb(91, 153, 206) |
| HSL | hsl(208, 54%, 58%) |
| OKLCH | oklch(66.3% 0.102 245.9) |
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 #5B99CE | 3.04:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #5B99CE | 6.89:1 | AA | Lc 46.9 | Large or bold text, headings |
| #5B99CE text on white | 3.04:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #5B99CE text on black | 6.89:1 | AA | Lc -44.6 | Non-text elements, placeholder text |
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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDBEB
oklch(88.4% 0.028 248.1)
-
Step 300
300
#A7C5E0
oklch(81% 0.05 245.6)
-
Step 400
400
#77A6D0
oklch(70.8% 0.08 246.2)
-
Step 500
500 (this color)
#5B99CE
oklch(66.3% 0.102 245.9)
-
Step 600
600
#3378B0
oklch(55.5% 0.111 246.2)
-
Step 700
700
#256597
oklch(49.1% 0.103 245.9)
-
Step 800
800
#21537B
oklch(42.8% 0.085 245.9)
-
Step 900
900
#204563
oklch(37.8% 0.067 245.4)
-
Step 950
950
#14283A
oklch(26.9% 0.043 247.2)
#5B99CE 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) | #829AD0 | 0.045 |
| Deuteranopia (no green cones) | #738FCD | 0.035 |
| Tritanopia (no blue cones) | #00A6AB | 0.087 |
| Achromatopsia (no color) | #949494 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B99CE
#5B99CE
oklch(66.3% 0.102 245.9)
- #BE864B
#BE864B
oklch(66.4% 0.102 65.9)
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 #5B99CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.055
- Greyblue #77A1B5 ΔE 0.057
- Silver Lake Blue #778DA9 ΔE 0.060
- Dusty Blue #5A86AD ΔE 0.064
- Blue Grey #758DA3 ΔE 0.066
Use #5B99CE 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.