#06378B
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.148 261), rgb(6, 55, 139).
Aa
White text reads best on this color (10.89:1).
About this color
#06378B is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.148 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.89:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.92:1 |
| White text | 10.89:1 |
Values
| HEX | #06378B |
| RGB | rgb(6, 55, 139) |
| HSL | hsl(218, 92%, 28%) |
| OKLCH | oklch(36.6% 0.148 261) |
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 #06378B | 10.89:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #06378B | 1.92:1 | Fails | Lc 9.4 | Not readable |
| #06378B text on white | 10.89:1 | AAA | Lc 94.5 | Preferred for body text |
| #06378B text on black | 1.92:1 | Fails | Lc -8.1 | 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
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3D83FF
oklch(63.2% 0.198 260.8)
-
Step 600
600
#0063FC
oklch(55.5% 0.241 261)
-
Step 700
700
#0053D6
oklch(49.1% 0.213 261)
-
Step 800
800
#0043B1
oklch(42.6% 0.185 261.1)
-
Step 900
900 (this color)
#06378B
oklch(36.6% 0.148 261)
-
Step 950
950
#082353
oklch(26.9% 0.094 260.9)
#06378B 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) | #00438E | 0.032 |
| Deuteranopia (no green cones) | #003789 | 0.005 |
| Tritanopia (no blue cones) | #004D5B | 0.114 |
| Achromatopsia (no color) | #3D3D3D | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #06378B
#06378B
oklch(36.6% 0.148 261)
- #533A00
#533A00
oklch(36.7% 0.076 81.4)
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 #06378B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Cobalt #1E488F ΔE 0.052
- Marine Blue #01386A ΔE 0.057
- Sapphire #2138AB ΔE 0.058
- Royal #0C1793 ΔE 0.064
- Light Navy #155084 ΔE 0.075
- Marine #042E60 ΔE 0.078
- Dark Slate Blue #483D8B ΔE 0.080
Use #06378B 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.