#143D77
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.109 257.9), rgb(20, 61, 119).
Aa
White text reads best on this color (10.69:1).
About this color
#143D77 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.109 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.017 away. White text reads best on it, at 10.69:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.69:1 |
Values
| HEX | #143D77 |
| RGB | rgb(20, 61, 119) |
| HSL | hsl(215, 71%, 27%) |
| OKLCH | oklch(36.7% 0.109 257.9) |
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 #143D77 | 10.69:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #143D77 | 1.96:1 | Fails | Lc 9.5 | Not readable |
| #143D77 text on white | 10.69:1 | AAA | Lc 94.4 | Preferred for body text |
| #143D77 text on black | 1.96:1 | Fails | Lc -8.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#A0C3F6
oklch(81% 0.082 257.7)
-
Step 400
400
#6BA1F1
oklch(70.6% 0.131 258)
-
Step 500
500
#4288ED
oklch(63.2% 0.168 257.9)
-
Step 600
600
#1F6FDB
oklch(55.7% 0.182 257.8)
-
Step 700
700
#105CBE
oklch(49.1% 0.169 257.8)
-
Step 800
800
#124C9A
oklch(42.8% 0.14 257.8)
-
Step 900
900 (this color)
#143D77
oklch(36.7% 0.109 257.9)
-
Step 950
950
#0F2648
oklch(27.1% 0.07 258.2)
#143D77 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) | #1D4379 | 0.021 |
| Deuteranopia (no green cones) | #023A76 | 0.015 |
| Tritanopia (no blue cones) | #004B54 | 0.084 |
| Achromatopsia (no color) | #3E3E3E | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143D77
#143D77
oklch(36.7% 0.109 257.9)
- #553900
#553900
oklch(36.8% 0.077 77.9)
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 #143D77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.017
- Marine Blue #01386A ΔE 0.030
- Cobalt #1E488F ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.057
- Light Navy #155084 ΔE 0.058
- Marine #042E60 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.068
Use #143D77 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.