#0C3D8C
Closest named color: Cobalt (#1E488F). oklch(38.2% 0.141 260.2), rgb(12, 61, 140).
Aa
White text reads best on this color (10.18:1).
About this color
#0C3D8C is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.141 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.035 away. White text reads best on it, at 10.18:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.06:1 |
| White text | 10.18:1 |
Values
| HEX | #0C3D8C |
| RGB | rgb(12, 61, 140) |
| HSL | hsl(217, 84%, 30%) |
| OKLCH | oklch(38.2% 0.141 260.2) |
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 #0C3D8C | 10.18:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #0C3D8C | 2.06:1 | Fails | Lc 10.9 | Not readable |
| #0C3D8C text on white | 10.18:1 | AAA | Lc 93.0 | Preferred for body text |
| #0C3D8C text on black | 2.06:1 | Fails | Lc -9.5 | 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
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3983FF
oklch(63.1% 0.199 260.2)
-
Step 600
600
#0066F6
oklch(55.6% 0.23 260.3)
-
Step 700
700
#0056D0
oklch(49.2% 0.201 260.1)
-
Step 800
800
#0046AD
oklch(42.8% 0.176 260.1)
-
Step 900
900 (this color)
#0C3D8C
oklch(38.2% 0.141 260.2)
-
Step 950
950
#092451
oklch(27.1% 0.089 260.2)
#0C3D8C 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) | #00478F | 0.027 |
| Deuteranopia (no green cones) | #003C8A | 0.008 |
| Tritanopia (no blue cones) | #00515E | 0.108 |
| Achromatopsia (no color) | #414141 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C3D8C
#0C3D8C
oklch(38.2% 0.141 260.2)
- #583D00
#583D00
oklch(38.1% 0.079 80.4)
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 #0C3D8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.035
- Twilight Blue #0A437A ΔE 0.036
- Sapphire #2138AB ΔE 0.055
- Light Navy #155084 ΔE 0.059
- Marine Blue #01386A ΔE 0.060
- Dusk Blue #26538D ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.070
- Blueberry #464196 ΔE 0.070
Use #0C3D8C 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.