#143A7F
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.125 261.2), rgb(20, 58, 127).
Aa
White text reads best on this color (10.81:1).
About this color
#143A7F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.125 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.028 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #143A7F |
| RGB | rgb(20, 58, 127) |
| HSL | hsl(219, 73%, 29%) |
| OKLCH | oklch(36.6% 0.125 261.2) |
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 #143A7F | 10.81:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #143A7F | 1.94:1 | Fails | Lc 9.3 | Not readable |
| #143A7F text on white | 10.81:1 | AAA | Lc 94.6 | Preferred for body text |
| #143A7F text on black | 1.94:1 | Fails | Lc -8.0 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC1FE
oklch(80.8% 0.094 261.9)
-
Step 400
400
#6A9FFD
oklch(70.7% 0.149 261.1)
-
Step 500
500
#4183FB
oklch(63.1% 0.192 261.2)
-
Step 600
600
#2169EA
oklch(55.6% 0.208 261.1)
-
Step 700
700
#1456CC
oklch(49.1% 0.194 261.3)
-
Step 800
800
#1347A5
oklch(42.6% 0.161 261.2)
-
Step 900
900 (this color)
#143A7F
oklch(36.6% 0.125 261.2)
-
Step 950
950
#0E244C
oklch(26.8% 0.079 261.2)
#143A7F 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) | #074281 | 0.022 |
| Deuteranopia (no green cones) | #00397E | 0.012 |
| Tritanopia (no blue cones) | #004B56 | 0.097 |
| Achromatopsia (no color) | #3D3D3D | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143A7F
#143A7F
oklch(36.6% 0.125 261.2)
- #533A00
#533A00
oklch(36.7% 0.076 81.4)
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 #143A7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.028
- Marine Blue #01386A ΔE 0.039
- Cobalt #1E488F ΔE 0.048
- Light Navy #155084 ΔE 0.064
- Marine #042E60 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.072
- Sapphire #2138AB ΔE 0.074
Use #143A7F 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.