#143B6A
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.093 255.1), rgb(20, 59, 106).
Aa
White text reads best on this color (11.26:1).
About this color
#143B6A is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.093 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.016 away. White text reads best on it, at 11.26:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #143B6A |
| RGB | rgb(20, 59, 106) |
| HSL | hsl(213, 68%, 25%) |
| OKLCH | oklch(35.2% 0.093 255.1) |
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 #143B6A | 11.26:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #143B6A | 1.86:1 | Fails | Lc 8.2 | Not readable |
| #143B6A text on white | 11.26:1 | AAA | Lc 95.7 | Preferred for body text |
| #143B6A text on black | 1.86:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A3C3EE
oklch(80.9% 0.07 255.9)
-
Step 400
400
#70A3E5
oklch(70.7% 0.112 255.3)
-
Step 500
500
#488BDD
oklch(63.1% 0.142 254.8)
-
Step 600
600
#2873CB
oklch(55.6% 0.154 255)
-
Step 700
700
#1A60B0
oklch(49.2% 0.144 255.1)
-
Step 800
800
#194F8E
oklch(42.8% 0.118 254.9)
-
Step 900
900 (this color)
#143B6A
oklch(35.2% 0.093 255.1)
-
Step 950
950
#112742
oklch(27% 0.058 254.7)
#143B6A 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) | #243F6C | 0.022 |
| Deuteranopia (no green cones) | #153769 | 0.012 |
| Tritanopia (no blue cones) | #00464D | 0.070 |
| Achromatopsia (no color) | #3B3B3B | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143B6A
#143B6A
oklch(35.2% 0.093 255.1)
- #513400
#513400
oklch(35.1% 0.074 74.8)
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 #143B6A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Twilight Blue #0A437A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Marine #042E60 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.054
- Midnight Green #073B4C ΔE 0.055
- Charcoal #264653 ΔE 0.063
Use #143B6A 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.