#143D75
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.106 257.4), rgb(20, 61, 117).
Aa
White text reads best on this color (10.74:1).
About this color
#143D75 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.106 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #143D75 |
| RGB | rgb(20, 61, 117) |
| HSL | hsl(215, 71%, 27%) |
| OKLCH | oklch(36.5% 0.106 257.4) |
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 #143D75 | 10.74:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #143D75 | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #143D75 text on white | 10.74:1 | AAA | Lc 94.5 | Preferred for body text |
| #143D75 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A0C3F4
oklch(80.9% 0.079 256.8)
-
Step 400
400
#6CA2EF
oklch(70.7% 0.127 257.3)
-
Step 500
500
#4388EA
oklch(63.1% 0.163 257.6)
-
Step 600
600
#2070D8
oklch(55.7% 0.177 257.2)
-
Step 700
700
#115DBB
oklch(49.1% 0.164 257.2)
-
Step 800
800
#134C98
oklch(42.7% 0.137 257.6)
-
Step 900
900 (this color)
#143D75
oklch(36.5% 0.106 257.4)
-
Step 950
950
#0F2647
oklch(27% 0.068 257.7)
#143D75 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) | #1F4277 | 0.019 |
| Deuteranopia (no green cones) | #073A74 | 0.013 |
| Tritanopia (no blue cones) | #004A53 | 0.081 |
| Achromatopsia (no color) | #3E3E3E | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143D75
#143D75
oklch(36.5% 0.106 257.4)
- #543800
#543800
oklch(36.4% 0.076 77.5)
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 #143D75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Marine Blue #01386A ΔE 0.028
- Cobalt #1E488F ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.054
- Marine #042E60 ΔE 0.059
- Light Navy #155084 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.068
Use #143D75 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.