#063788
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.144 260.7), rgb(6, 55, 136).
Aa
White text reads best on this color (10.99:1).
About this color
#063788 is a dark, vivid blue. In OKLCH its lightness is 36%, 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 0.043 away. White text reads best on it, at 10.99:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 10.99:1 |
Values
| HEX | #063788 |
| RGB | rgb(6, 55, 136) |
| HSL | hsl(217, 92%, 28%) |
| OKLCH | oklch(36.4% 0.144 260.7) |
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 #063788 | 10.99:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #063788 | 1.90:1 | Fails | Lc 9.2 | Not readable |
| #063788 text on white | 10.99:1 | AAA | Lc 94.7 | Preferred for body text |
| #063788 text on black | 1.90:1 | Fails | Lc -7.9 | 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
#679FFF
oklch(70.7% 0.153 260.6)
-
Step 500
500
#3C83FF
oklch(63.2% 0.198 260.7)
-
Step 600
600
#0065F9
oklch(55.6% 0.235 260.6)
-
Step 700
700
#0054D3
oklch(49% 0.208 260.7)
-
Step 800
800
#0044AF
oklch(42.6% 0.181 260.7)
-
Step 900
900 (this color)
#063788
oklch(36.4% 0.144 260.7)
-
Step 950
950
#092352
oklch(26.9% 0.092 261.1)
#063788 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) | #00428B | 0.030 |
| Deuteranopia (no green cones) | #003786 | 0.005 |
| Tritanopia (no blue cones) | #004C5A | 0.110 |
| Achromatopsia (no color) | #3C3C3C | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063788
#063788
oklch(36.4% 0.144 260.7)
- #523900
#523900
oklch(36.4% 0.075 81)
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 #063788, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Marine Blue #01386A ΔE 0.052
- Cobalt #1E488F ΔE 0.053
- Sapphire #2138AB ΔE 0.062
- Royal #0C1793 ΔE 0.065
- Marine #042E60 ΔE 0.073
- Light Navy #155084 ΔE 0.075
- Dark Slate Blue #483D8B ΔE 0.080
Use #063788 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.