#143F63
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.078 247.6), rgb(20, 63, 99).
Aa
White text reads best on this color (10.93:1).
About this color
#143F63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.078 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 10.93:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.92:1 |
| White text | 10.93:1 |
Values
| HEX | #143F63 |
| RGB | rgb(20, 63, 99) |
| HSL | hsl(207, 66%, 23%) |
| OKLCH | oklch(35.7% 0.078 247.6) |
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 #143F63 | 10.93:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #143F63 | 1.92:1 | Fails | Lc 8.9 | Not readable |
| #143F63 text on white | 10.93:1 | AAA | Lc 95.0 | Preferred for body text |
| #143F63 text on black | 1.92:1 | Fails | Lc -7.6 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DCEE
oklch(88.6% 0.032 246.7)
-
Step 300
300
#A3C5E5
oklch(80.9% 0.058 247)
-
Step 400
400
#70A6D8
oklch(70.7% 0.093 247.4)
-
Step 500
500
#478FCE
oklch(63.2% 0.12 247.4)
-
Step 600
600
#2478BB
oklch(55.7% 0.13 247.4)
-
Step 700
700
#1564A1
oklch(49% 0.121 247.8)
-
Step 800
800
#165283
oklch(42.7% 0.101 248)
-
Step 900
900 (this color)
#143F63
oklch(35.7% 0.078 247.6)
-
Step 950
950
#10283D
oklch(26.9% 0.05 247.3)
#143F63 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) | #2E4165 | 0.029 |
| Deuteranopia (no green cones) | #233962 | 0.021 |
| Tritanopia (no blue cones) | #00484C | 0.058 |
| Achromatopsia (no color) | #3D3D3D | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143F63
#143F63
oklch(35.7% 0.078 247.6)
- #573301
#573301
oklch(35.7% 0.078 67.3)
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 #143F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.038
- Twilight Blue #0A437A ΔE 0.039
- Midnight Green #073B4C ΔE 0.043
- Charcoal #264653 ΔE 0.044
- Marine #042E60 ΔE 0.056
Use #143F63 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.