#143759
Closest named color: Prussian Blue (#1D3557). oklch(33% 0.073 250.4), rgb(20, 55, 89).
Aa
White text reads best on this color (12.20:1).
About this color
#143759 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.073 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.010 away. White text reads best on it, at 12.20:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.72:1 |
| White text | 12.20:1 |
Values
| HEX | #143759 |
| RGB | rgb(20, 55, 89) |
| HSL | hsl(210, 63%, 21%) |
| OKLCH | oklch(33% 0.073 250.4) |
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 #143759 | 12.20:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #143759 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #143759 text on white | 12.20:1 | AAA | Lc 97.6 | Preferred for body text |
| #143759 text on black | 1.72:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A7C4E3
oklch(80.9% 0.054 250.2)
-
Step 400
400
#77A5D5
oklch(70.7% 0.086 250.2)
-
Step 500
500
#528DCA
oklch(63% 0.111 250.7)
-
Step 600
600
#3477B7
oklch(55.7% 0.121 250)
-
Step 700
700
#26639E
oklch(49% 0.113 250.7)
-
Step 800
800
#225180
oklch(42.7% 0.094 251)
-
Step 900
900 (this color)
#143759
oklch(33% 0.073 250.4)
-
Step 950
950
#14283C
oklch(27.1% 0.046 249.9)
#143759 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) | #28395A | 0.024 |
| Deuteranopia (no green cones) | #1E3258 | 0.017 |
| Tritanopia (no blue cones) | #003F43 | 0.055 |
| Achromatopsia (no color) | #353535 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143759
#143759
oklch(33% 0.073 250.4)
- #4C2E00
#4C2E00
oklch(33% 0.071 70.9)
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 #143759, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.010
- Dark Blue Grey #1F3B4D ΔE 0.030
- Marine Blue #01386A ΔE 0.031
- Midnight Green #073B4C ΔE 0.031
- Marine #042E60 ΔE 0.036
- Gunmetal #293241 ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.057
Use #143759 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.