#0B3F84
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.127 257.9), rgb(11, 63, 132).
Aa
White text reads best on this color (10.20:1).
About this color
#0B3F84 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.127 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.022 away. White text reads best on it, at 10.20:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.20:1 |
Values
| HEX | #0B3F84 |
| RGB | rgb(11, 63, 132) |
| HSL | hsl(214, 85%, 28%) |
| OKLCH | oklch(37.9% 0.127 257.9) |
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 #0B3F84 | 10.20:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #0B3F84 | 2.05:1 | Fails | Lc 10.8 | Not readable |
| #0B3F84 text on white | 10.20:1 | AAA | Lc 93.1 | Preferred for body text |
| #0B3F84 text on black | 2.05:1 | Fails | Lc -9.4 | Not readable |
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 900.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFD
oklch(88.5% 0.053 258)
-
Step 300
300
#9AC3FE
oklch(80.9% 0.095 257.4)
-
Step 400
400
#61A1FE
oklch(70.8% 0.152 257.8)
-
Step 500
500
#3085FC
oklch(63% 0.195 258)
-
Step 600
600
#006CE7
oklch(55.5% 0.204 257.8)
-
Step 700
700
#005BC4
oklch(49.2% 0.18 257.7)
-
Step 800
800
#004AA2
oklch(42.7% 0.156 257.7)
-
Step 900
900 (this color)
#0B3F84
oklch(37.9% 0.127 257.9)
-
Step 950
950
#09254D
oklch(27% 0.081 258.1)
#0B3F84 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) | #114786 | 0.024 |
| Deuteranopia (no green cones) | #003C83 | 0.011 |
| Tritanopia (no blue cones) | #00505B | 0.097 |
| Achromatopsia (no color) | #414141 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3F84
#0B3F84
oklch(37.9% 0.127 257.9)
- #593C00
#593C00
oklch(38% 0.079 78.1)
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 #0B3F84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Cobalt #1E488F ΔE 0.035
- Marine Blue #01386A ΔE 0.049
- Light Navy #155084 ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.063
- Dusk Blue #26538D ΔE 0.065
- Sapphire #2138AB ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.071
Use #0B3F84 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.