#143781
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.132 262.7), rgb(20, 55, 129).
Aa
White text reads best on this color (11.09:1).
About this color
#143781 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.132 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 11.09:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #143781 |
| RGB | rgb(20, 55, 129) |
| HSL | hsl(221, 73%, 29%) |
| OKLCH | oklch(36.1% 0.132 262.7) |
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 #143781 | 11.09:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #143781 | 1.89:1 | Fails | Lc 8.8 | Not readable |
| #143781 text on white | 11.09:1 | AAA | Lc 95.1 | Preferred for body text |
| #143781 text on black | 1.89:1 | Fails | Lc -7.5 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C6DAFE
oklch(88.5% 0.054 262.2)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4481FF
oklch(63% 0.198 262.7)
-
Step 600
600
#2566F1
oklch(55.7% 0.219 262.7)
-
Step 700
700
#1853D2
oklch(49.1% 0.205 262.7)
-
Step 800
800
#1645A9
oklch(42.6% 0.169 262.6)
-
Step 900
900 (this color)
#143781
oklch(36.1% 0.132 262.7)
-
Step 950
950
#0F244E
oklch(27% 0.082 262.4)
#143781 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) | #004184 | 0.027 |
| Deuteranopia (no green cones) | #003780 | 0.012 |
| Tritanopia (no blue cones) | #004956 | 0.101 |
| Achromatopsia (no color) | #3C3C3C | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143781
#143781
oklch(36.1% 0.132 262.7)
- #503900
#503900
oklch(36.1% 0.074 83.2)
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 #143781, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.042
- Cobalt #1E488F ΔE 0.054
- Marine #042E60 ΔE 0.064
- Sapphire #2138AB ΔE 0.071
- Light Navy #155084 ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.072
- Royal #0C1793 ΔE 0.073
Use #143781 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.