#0B5999
Closest named color: Dusk Blue (#26538D). oklch(45.7% 0.125 250.3), rgb(11, 89, 153).
Aa
White text reads best on this color (7.23:1).
About this color
#0B5999 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.125 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.025 away. White text reads best on it, at 7.23:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.90:1 |
| White text | 7.23:1 |
Values
| HEX | #0B5999 |
| RGB | rgb(11, 89, 153) |
| HSL | hsl(207, 87%, 32%) |
| OKLCH | oklch(45.7% 0.125 250.3) |
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 #0B5999 | 7.23:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #0B5999 | 2.90:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #0B5999 text on white | 7.23:1 | AAA | Lc 84.6 | Fine for body text |
| #0B5999 text on black | 2.90:1 | Fails | Lc -17.4 | Dividers and decoration only |
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 800.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9DC5EF
oklch(80.9% 0.073 250)
-
Step 400
400
#66A5E6
oklch(70.6% 0.116 250.5)
-
Step 500
500
#358DDF
oklch(63.1% 0.149 250.2)
-
Step 600
600
#0075CB
oklch(55.5% 0.159 250.4)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800 (this color)
#0B5999
oklch(45.7% 0.125 250.3)
-
Step 900
900
#0E4373
oklch(37.7% 0.098 250.8)
-
Step 950
950
#0B2843
oklch(27.1% 0.061 249.8)
#0B5999 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) | #395D9C | 0.037 |
| Deuteranopia (no green cones) | #205198 | 0.023 |
| Tritanopia (no blue cones) | #006871 | 0.090 |
| Achromatopsia (no color) | #575757 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B5999
#0B5999
oklch(45.7% 0.125 250.3)
- #794C00
#794C00
oklch(45.7% 0.099 70.8)
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 #0B5999, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.025
- Light Navy Blue #2E5A88 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.040
- Light Navy #155084 ΔE 0.040
- Peacock Blue #016795 ΔE 0.043
- Cobalt #1E488F ΔE 0.048
- Denim #3B638C ΔE 0.055
Use #0B5999 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.