#143E71
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.099 255.4), rgb(20, 62, 113).
Aa
White text reads best on this color (10.72:1).
About this color
#143E71 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.099 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.019 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #143E71 |
| RGB | rgb(20, 62, 113) |
| HSL | hsl(213, 70%, 26%) |
| OKLCH | oklch(36.4% 0.099 255.4) |
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 #143E71 | 10.72:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #143E71 | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #143E71 text on white | 10.72:1 | AAA | Lc 94.5 | Preferred for body text |
| #143E71 text on black | 1.95:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A1C3F1
oklch(80.8% 0.075 256.1)
-
Step 400
400
#6DA3EA
oklch(70.7% 0.119 255.7)
-
Step 500
500
#438AE3
oklch(63.1% 0.152 255.4)
-
Step 600
600
#2072D1
oklch(55.6% 0.165 255.4)
-
Step 700
700
#115FB5
oklch(49.1% 0.154 255.4)
-
Step 800
800
#134E93
oklch(42.8% 0.128 255.6)
-
Step 900
900 (this color)
#143E71
oklch(36.4% 0.099 255.4)
-
Step 950
950
#0F2744
oklch(27% 0.062 254.6)
#143E71 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) | #244273 | 0.021 |
| Deuteranopia (no green cones) | #133A70 | 0.012 |
| Tritanopia (no blue cones) | #004A52 | 0.075 |
| Achromatopsia (no color) | #3E3E3E | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143E71
#143E71
oklch(36.4% 0.099 255.4)
- #553700
#553700
oklch(36.3% 0.077 75.1)
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 #143E71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.019
- Marine Blue #01386A ΔE 0.026
- Prussian Blue #1D3557 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.055
- Cobalt #1E488F ΔE 0.057
- Marine #042E60 ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #143E71 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.