#143D63
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.08 249.8), rgb(20, 61, 99).
Aa
White text reads best on this color (11.18:1).
About this color
#143D63 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.080 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.18:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.18:1 |
Values
| HEX | #143D63 |
| RGB | rgb(20, 61, 99) |
| HSL | hsl(209, 66%, 23%) |
| OKLCH | oklch(35.2% 0.08 249.8) |
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 #143D63 | 11.18:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #143D63 | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #143D63 text on white | 11.18:1 | AAA | Lc 95.6 | Preferred for body text |
| #143D63 text on black | 1.87:1 | Fails | Lc 0.0 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#71A5DB
oklch(70.7% 0.097 250.2)
-
Step 500
500
#498ED1
oklch(63.2% 0.123 249.8)
-
Step 600
600
#2877BE
oklch(55.7% 0.134 249.7)
-
Step 700
700
#1963A4
oklch(49% 0.125 250.1)
-
Step 800
800
#185185
oklch(42.6% 0.104 250.2)
-
Step 900
900 (this color)
#143D63
oklch(35.2% 0.08 249.8)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#143D63 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) | #2B3F65 | 0.026 |
| Deuteranopia (no green cones) | #203862 | 0.017 |
| Tritanopia (no blue cones) | #00464B | 0.059 |
| Achromatopsia (no color) | #3B3B3B | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143D63
#143D63
oklch(35.2% 0.08 249.8)
- #543300
#543300
oklch(35.3% 0.076 70.4)
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 #143D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.038
- Twilight Blue #0A437A ΔE 0.041
- Midnight Green #073B4C ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.043
- Charcoal #264653 ΔE 0.050
- Marine #042E60 ΔE 0.050
Use #143D63 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.