#143E59
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.9% 0.066 240.8), rgb(20, 62, 89).
Aa
White text reads best on this color (11.27:1).
About this color
#143E59 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.066 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.022 away. White text reads best on it, at 11.27:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.27:1 |
Values
| HEX | #143E59 |
| RGB | rgb(20, 62, 89) |
| HSL | hsl(203, 63%, 21%) |
| OKLCH | oklch(34.9% 0.066 240.8) |
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 #143E59 | 11.27:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #143E59 | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #143E59 text on white | 11.27:1 | AAA | Lc 95.8 | Preferred for body text |
| #143E59 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A5C5DE
oklch(80.8% 0.049 241.8)
-
Step 400
400
#73A7CD
oklch(70.6% 0.078 241)
-
Step 500
500
#4B91C1
oklch(63.1% 0.101 240.9)
-
Step 600
600
#2A7AAD
oklch(55.5% 0.11 241.1)
-
Step 700
700
#1B6795
oklch(49.2% 0.102 240.9)
-
Step 800
800
#1A5479
oklch(42.7% 0.085 241.2)
-
Step 900
900 (this color)
#143E59
oklch(34.9% 0.066 240.8)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#143E59 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) | #323E5A | 0.034 |
| Deuteranopia (no green cones) | #283859 | 0.026 |
| Tritanopia (no blue cones) | #004547 | 0.047 |
| Achromatopsia (no color) | #3B3B3B | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143E59
#143E59
oklch(34.9% 0.066 240.8)
- #533112
#533112
oklch(34.9% 0.066 60)
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 #143E59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.022
- Midnight Green #073B4C ΔE 0.026
- Prussian Blue #1D3557 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.037
- Marine Blue #01386A ΔE 0.040
- Gunmetal #293241 ΔE 0.051
- Onyx #343A40 ΔE 0.053
Use #143E59 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.