#143C7A
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.115 259.2), rgb(20, 60, 122).
Aa
White text reads best on this color (10.73:1).
About this color
#143C7A is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.115 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 10.73:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.73:1 |
Values
| HEX | #143C7A |
| RGB | rgb(20, 60, 122) |
| HSL | hsl(216, 72%, 28%) |
| OKLCH | oklch(36.6% 0.115 259.2) |
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 #143C7A | 10.73:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #143C7A | 1.95:1 | Fails | Lc 9.5 | Not readable |
| #143C7A text on white | 10.73:1 | AAA | Lc 94.4 | Preferred for body text |
| #143C7A 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DBF9
oklch(88.6% 0.047 258.4)
-
Step 300
300
#9FC2F9
oklch(80.8% 0.087 259.3)
-
Step 400
400
#6BA1F6
oklch(70.8% 0.138 259.1)
-
Step 500
500
#4286F2
oklch(63.1% 0.176 259.4)
-
Step 600
600
#206DE1
oklch(55.7% 0.192 259.2)
-
Step 700
700
#125AC3
oklch(49.1% 0.178 259.2)
-
Step 800
800
#134A9E
oklch(42.7% 0.148 259.4)
-
Step 900
900 (this color)
#143C7A
oklch(36.6% 0.115 259.2)
-
Step 950
950
#0F2549
oklch(26.9% 0.073 259.8)
#143C7A 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) | #17437C | 0.021 |
| Deuteranopia (no green cones) | #003979 | 0.016 |
| Tritanopia (no blue cones) | #004B55 | 0.088 |
| Achromatopsia (no color) | #3E3E3E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143C7A
#143C7A
oklch(36.6% 0.115 259.2)
- #543900
#543900
oklch(36.6% 0.076 78.9)
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 #143C7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Marine Blue #01386A ΔE 0.033
- Cobalt #1E488F ΔE 0.049
- Light Navy #155084 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.061
- Marine #042E60 ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.070
Use #143C7A 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.