#0C3B8C
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.144 260.9), rgb(12, 59, 140).
Aa
White text reads best on this color (10.39:1).
About this color
#0C3B8C is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.144 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 10.39:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.39:1 |
Values
| HEX | #0C3B8C |
| RGB | rgb(12, 59, 140) |
| HSL | hsl(218, 84%, 30%) |
| OKLCH | oklch(37.7% 0.144 260.9) |
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 #0C3B8C | 10.39:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #0C3B8C | 2.01:1 | Fails | Lc 10.5 | Not readable |
| #0C3B8C text on white | 10.39:1 | AAA | Lc 93.5 | Preferred for body text |
| #0C3B8C text on black | 2.01:1 | Fails | Lc -9.0 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3C83FF
oklch(63.2% 0.198 260.7)
-
Step 600
600
#0064FB
oklch(55.6% 0.238 260.9)
-
Step 700
700
#0054D5
oklch(49.2% 0.21 260.8)
-
Step 800
800
#0044B0
oklch(42.7% 0.182 260.8)
-
Step 900
900 (this color)
#0C3B8C
oklch(37.7% 0.144 260.9)
-
Step 950
950
#092352
oklch(26.9% 0.092 261.1)
#0C3B8C 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) | #00468F | 0.029 |
| Deuteranopia (no green cones) | #003A8A | 0.008 |
| Tritanopia (no blue cones) | #004F5D | 0.109 |
| Achromatopsia (no color) | #404040 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C3B8C
#0C3B8C
oklch(37.7% 0.144 260.9)
- #573C00
#573C00
oklch(37.7% 0.078 80.1)
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 #0C3B8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Cobalt #1E488F ΔE 0.040
- Sapphire #2138AB ΔE 0.054
- Marine Blue #01386A ΔE 0.059
- Light Navy #155084 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.072
- Blueberry #464196 ΔE 0.072
- Dusk Blue #26538D ΔE 0.074
Use #0C3B8C 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.