#0B539D
Closest named color: Dusk Blue (#26538D). oklch(44.5% 0.137 254.5), rgb(11, 83, 157).
Aa
White text reads best on this color (7.66:1).
About this color
#0B539D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.137 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.029 away. White text reads best on it, at 7.66:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.66:1 |
Values
| HEX | #0B539D |
| RGB | rgb(11, 83, 157) |
| HSL | hsl(210, 87%, 33%) |
| OKLCH | oklch(44.5% 0.137 254.5) |
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 #0B539D | 7.66:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #0B539D | 2.73:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #0B539D text on white | 7.66:1 | AAA | Lc 86.1 | Fine for body text |
| #0B539D text on black | 2.73:1 | Fails | Lc -16.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC4F4
oklch(81% 0.08 254.5)
-
Step 400
400
#66A3EF
oklch(70.6% 0.129 254.7)
-
Step 500
500
#388AE9
oklch(63.1% 0.163 254.4)
-
Step 600
600
#0571D7
oklch(55.5% 0.178 254.6)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800 (this color)
#0B539D
oklch(44.5% 0.137 254.5)
-
Step 900
900
#104178
oklch(37.6% 0.107 254.6)
-
Step 950
950
#0C2746
oklch(27.1% 0.066 254)
#0B539D 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) | #295AA0 | 0.030 |
| Deuteranopia (no green cones) | #004D9C | 0.018 |
| Tritanopia (no blue cones) | #006570 | 0.102 |
| Achromatopsia (no color) | #535353 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B539D
#0B539D
oklch(44.5% 0.137 254.5)
- #724B00
#724B00
oklch(44.6% 0.094 74.9)
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 #0B539D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.029
- Cobalt #1E488F ΔE 0.035
- Light Navy #155084 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.050
- Peacock Blue #016795 ΔE 0.062
- Blueberry #464196 ΔE 0.066
Use #0B539D 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.