#0C398D
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.148 261.6), rgb(12, 57, 141).
Aa
White text reads best on this color (10.57:1).
About this color
#0C398D is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.148 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.57:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.57:1 |
Values
| HEX | #0C398D |
| RGB | rgb(12, 57, 141) |
| HSL | hsl(219, 84%, 30%) |
| OKLCH | oklch(37.4% 0.148 261.6) |
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 #0C398D | 10.57:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #0C398D | 1.98:1 | Fails | Lc 10.1 | Not readable |
| #0C398D text on white | 10.57:1 | AAA | Lc 93.8 | Preferred for body text |
| #0C398D text on black | 1.98:1 | Fails | Lc -8.7 | 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
#DFEBFF
oklch(93.7% 0.03 260.7)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#6A9EFF
oklch(70.6% 0.153 261.9)
-
Step 500
500
#4082FF
oklch(63.1% 0.198 261.6)
-
Step 600
600
#0562FF
oklch(55.6% 0.245 261.5)
-
Step 700
700
#0051DA
oklch(49.1% 0.22 261.5)
-
Step 800
800
#0242B4
oklch(42.7% 0.19 261.6)
-
Step 900
900 (this color)
#0C398D
oklch(37.4% 0.148 261.6)
-
Step 950
950
#092353
oklch(27% 0.093 261.3)
#0C398D 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) | #004590 | 0.032 |
| Deuteranopia (no green cones) | #00398B | 0.007 |
| Tritanopia (no blue cones) | #004E5D | 0.112 |
| Achromatopsia (no color) | #3F3F3F | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C398D
#0C398D
oklch(37.4% 0.148 261.6)
- #553C00
#553C00
oklch(37.4% 0.077 82.1)
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 #0C398D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Cobalt #1E488F ΔE 0.045
- Sapphire #2138AB ΔE 0.053
- Marine Blue #01386A ΔE 0.061
- Royal #0C1793 ΔE 0.069
- Light Navy #155084 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.074
- Blueberry #464196 ΔE 0.075
Use #0C398D 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.