#063C8A
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.141 259.3), rgb(6, 60, 138).
Aa
White text reads best on this color (10.39:1).
About this color
#063C8A is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.141 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.39:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.39:1 |
Values
| HEX | #063C8A |
| RGB | rgb(6, 60, 138) |
| HSL | hsl(215, 92%, 28%) |
| OKLCH | oklch(37.6% 0.141 259.3) |
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 #063C8A | 10.39:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #063C8A | 2.02:1 | Fails | Lc 10.5 | Not readable |
| #063C8A text on white | 10.39:1 | AAA | Lc 93.4 | Preferred for body text |
| #063C8A text on black | 2.02:1 | Fails | Lc -9.1 | 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
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C3DBFF
oklch(88.5% 0.056 258.4)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#64A0FF
oklch(70.8% 0.153 259.2)
-
Step 500
500
#3584FF
oklch(63.2% 0.199 259.3)
-
Step 600
600
#0069F0
oklch(55.7% 0.219 259.3)
-
Step 700
700
#0058CB
oklch(49.1% 0.193 259.2)
-
Step 800
800
#0047A8
oklch(42.6% 0.168 259.4)
-
Step 900
900 (this color)
#063C8A
oklch(37.6% 0.141 259.3)
-
Step 950
950
#072451
oklch(27% 0.089 259.3)
#063C8A 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) | #00468D | 0.027 |
| Deuteranopia (no green cones) | #003A88 | 0.008 |
| Tritanopia (no blue cones) | #00505D | 0.107 |
| Achromatopsia (no color) | #404040 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063C8A
#063C8A
oklch(37.6% 0.141 259.3)
- #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 #063C8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.040
- Marine Blue #01386A ΔE 0.056
- Sapphire #2138AB ΔE 0.058
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.073
- Deep Sea Blue #015482 ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.074
Use #063C8A 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.