#143B59
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.068 245.2), rgb(20, 59, 89).
Aa
White text reads best on this color (11.66:1).
About this color
#143B59 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.068 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 11.66:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.66:1 |
Values
| HEX | #143B59 |
| RGB | rgb(20, 59, 89) |
| HSL | hsl(206, 63%, 21%) |
| OKLCH | oklch(34.1% 0.068 245.2) |
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 #143B59 | 11.66:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #143B59 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #143B59 text on white | 11.66:1 | AAA | Lc 96.6 | Preferred for body text |
| #143B59 text on black | 1.79:1 | 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
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A6C5E0
oklch(81% 0.051 244.8)
-
Step 400
400
#75A6D1
oklch(70.7% 0.082 245.8)
-
Step 500
500
#4E8FC5
oklch(63% 0.106 245.6)
-
Step 600
600
#2F79B1
oklch(55.7% 0.113 244.9)
-
Step 700
700
#206599
oklch(49% 0.107 245.6)
-
Step 800
800
#1D537C
oklch(42.7% 0.088 245.2)
-
Step 900
900 (this color)
#143B59
oklch(34.1% 0.068 245.2)
-
Step 950
950
#13283A
oklch(26.9% 0.043 246.2)
#143B59 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) | #2D3C5A | 0.029 |
| Deuteranopia (no green cones) | #243558 | 0.023 |
| Tritanopia (no blue cones) | #004246 | 0.048 |
| Achromatopsia (no color) | #383838 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143B59
#143B59
oklch(34.1% 0.068 245.2)
- #50300A
#50300A
oklch(34.2% 0.068 65.5)
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 #143B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.023
- Midnight Green #073B4C ΔE 0.026
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.044
- Charcoal #264653 ΔE 0.046
- Gunmetal #293241 ΔE 0.048
- Marine #042E60 ΔE 0.048
Use #143B59 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.