#143F5D
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.4% 0.07 243), rgb(20, 63, 93).
Aa
White text reads best on this color (11.05:1).
About this color
#143F5D is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.070 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.028 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #143F5D |
| RGB | rgb(20, 63, 93) |
| HSL | hsl(205, 65%, 22%) |
| OKLCH | oklch(35.4% 0.07 243) |
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 #143F5D | 11.05:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #143F5D | 1.89:1 | Fails | Lc 8.6 | Not readable |
| #143F5D text on white | 11.05:1 | AAA | Lc 95.3 | Preferred for body text |
| #143F5D text on black | 1.89:1 | Fails | Lc -7.3 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400
#71A7D1
oklch(70.7% 0.084 242.8)
-
Step 500
500
#4990C5
oklch(63% 0.107 243.3)
-
Step 600
600
#267AB2
oklch(55.7% 0.117 242.8)
-
Step 700
700
#176699
oklch(49.1% 0.109 243.2)
-
Step 800
800
#17547C
oklch(42.8% 0.09 242.5)
-
Step 900
900 (this color)
#143F5D
oklch(35.4% 0.07 243)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#143F5D 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) | #31405E | 0.033 |
| Deuteranopia (no green cones) | #27395C | 0.025 |
| Tritanopia (no blue cones) | #00464A | 0.048 |
| Achromatopsia (no color) | #3C3C3C | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143F5D
#143F5D
oklch(35.4% 0.07 243)
- #55320E
#55320E
oklch(35.3% 0.07 62.2)
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 #143F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.031
- Midnight Green #073B4C ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.034
- Marine Blue #01386A ΔE 0.037
- Charcoal #264653 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.049
- Gunmetal #293241 ΔE 0.057
Use #143F5D 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.