#0B3C83
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.13 259), rgb(11, 60, 131).
Aa
White text reads best on this color (10.56:1).
About this color
#0B3C83 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.130 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.56:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.56:1 |
Values
| HEX | #0B3C83 |
| RGB | rgb(11, 60, 131) |
| HSL | hsl(216, 85%, 28%) |
| OKLCH | oklch(37.1% 0.13 259) |
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 #0B3C83 | 10.56:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #0B3C83 | 1.98:1 | Fails | Lc 10.0 | Not readable |
| #0B3C83 text on white | 10.56:1 | AAA | Lc 93.9 | Preferred for body text |
| #0B3C83 text on black | 1.98:1 | Fails | Lc -8.6 | 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
#C4DBFE
oklch(88.6% 0.054 258.7)
-
Step 300
300
#9BC2FF
oklch(80.8% 0.097 259.2)
-
Step 400
400
#63A0FF
oklch(70.7% 0.154 259)
-
Step 500
500
#3384FF
oklch(63.1% 0.199 259)
-
Step 600
600
#006AEE
oklch(55.7% 0.215 258.9)
-
Step 700
700
#0058C9
oklch(49% 0.19 259)
-
Step 800
800
#0048A7
oklch(42.7% 0.165 259)
-
Step 900
900 (this color)
#0B3C83
oklch(37.1% 0.13 259)
-
Step 950
950
#0A254E
oklch(27.1% 0.082 258.9)
#0B3C83 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) | #054486 | 0.022 |
| Deuteranopia (no green cones) | #003A82 | 0.009 |
| Tritanopia (no blue cones) | #004E59 | 0.100 |
| Achromatopsia (no color) | #3F3F3F | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3C83
#0B3C83
oklch(37.1% 0.13 259)
- #563A00
#563A00
oklch(37.1% 0.077 78.3)
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 #0B3C83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Cobalt #1E488F ΔE 0.043
- Marine Blue #01386A ΔE 0.045
- Light Navy #155084 ΔE 0.060
- Sapphire #2138AB ΔE 0.069
- Deep Sea Blue #015482 ΔE 0.071
- Marine #042E60 ΔE 0.072
- Dusk Blue #26538D ΔE 0.074
Use #0B3C83 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.