#0B538F
Closest named color: Dusk Blue (#26538D). oklch(43.5% 0.118 250.4), rgb(11, 83, 143).
Aa
White text reads best on this color (7.93:1).
About this color
#0B538F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.118 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.016 away. White text reads best on it, at 7.93:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #0B538F |
| RGB | rgb(11, 83, 143) |
| HSL | hsl(207, 86%, 30%) |
| OKLCH | oklch(43.5% 0.118 250.4) |
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 #0B538F | 7.93:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #0B538F | 2.64:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #0B538F text on white | 7.93:1 | AAA | Lc 87.0 | Fine for body text |
| #0B538F text on black | 2.64:1 | Fails | Lc -15.1 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#69A5E3
oklch(70.6% 0.111 250.4)
-
Step 500
500
#3C8DDB
oklch(63% 0.142 250.4)
-
Step 600
600
#0F76C9
oklch(55.7% 0.154 250.3)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800 (this color)
#0B538F
oklch(43.5% 0.118 250.4)
-
Step 900
900
#134370
oklch(37.6% 0.092 250.7)
-
Step 950
950
#0D2842
oklch(27.1% 0.059 250.2)
#0B538F 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) | #355791 | 0.035 |
| Deuteranopia (no green cones) | #1E4C8E | 0.021 |
| Tritanopia (no blue cones) | #00616A | 0.084 |
| Achromatopsia (no color) | #515151 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B538F
#0B538F
oklch(43.5% 0.118 250.4)
- #714600
#714600
oklch(43.4% 0.094 70.1)
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 #0B538F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.016
- Light Navy #155084 ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.023
- Cobalt #1E488F ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.055
- Peacock Blue #016795 ΔE 0.059
Use #0B538F 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.