#143B8D
Closest named color: Cobalt (#1E488F). oklch(38% 0.143 262.6), rgb(20, 59, 141).
Aa
White text reads best on this color (10.29:1).
About this color
#143B8D is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.143 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.038 away. White text reads best on it, at 10.29:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.03:1 |
| White text | 10.29:1 |
Values
| HEX | #143B8D |
| RGB | rgb(20, 59, 141) |
| HSL | hsl(221, 75%, 32%) |
| OKLCH | oklch(38% 0.143 262.6) |
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 #143B8D | 10.29:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #143B8D | 2.03:1 | Fails | Lc 10.6 | Not readable |
| #143B8D text on white | 10.29:1 | AAA | Lc 93.3 | Preferred for body text |
| #143B8D text on black | 2.03:1 | Fails | Lc -9.2 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4481FF
oklch(63% 0.198 262.7)
-
Step 600
600
#1962FC
oklch(55.6% 0.239 262.6)
-
Step 700
700
#0C50DB
oklch(49.1% 0.221 262.5)
-
Step 800
800
#0E42B1
oklch(42.6% 0.184 262.6)
-
Step 900
900 (this color)
#143B8D
oklch(38% 0.143 262.6)
-
Step 950
950
#0C2352
oklch(27% 0.091 262.4)
#143B8D 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) | #004690 | 0.029 |
| Deuteranopia (no green cones) | #003B8B | 0.011 |
| Tritanopia (no blue cones) | #00505E | 0.111 |
| Achromatopsia (no color) | #404040 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143B8D
#143B8D
oklch(38% 0.143 262.6)
- #573E00
#573E00
oklch(38.2% 0.079 82.8)
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 #143B8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.038
- Twilight Blue #0A437A ΔE 0.041
- Sapphire #2138AB ΔE 0.051
- Marine Blue #01386A ΔE 0.062
- Light Navy #155084 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.067
- Blueberry #464196 ΔE 0.067
- Dusk Blue #26538D ΔE 0.072
Use #143B8D 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.