#143C9C
Closest named color: Sapphire (#2138AB). oklch(39.6% 0.163 263.5), rgb(20, 60, 156).
Aa
White text reads best on this color (9.73:1).
About this color
#143C9C is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.163 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.028 away. White text reads best on it, at 9.73:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.15:1 |
| White text | 9.73:1 |
Values
| HEX | #143C9C |
| RGB | rgb(20, 60, 156) |
| HSL | hsl(222, 77%, 35%) |
| OKLCH | oklch(39.6% 0.163 263.5) |
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 #143C9C | 9.73:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #143C9C | 2.15:1 | Fails | Lc 12.1 | Not readable |
| #143C9C text on white | 9.73:1 | AAA | Lc 91.9 | Preferred for body text |
| #143C9C text on black | 2.15:1 | Fails | Lc -10.5 | 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
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4881FF
oklch(63.2% 0.197 263.5)
-
Step 600
600
#1F60FF
oklch(55.6% 0.244 263.5)
-
Step 700
700
#0547EC
oklch(49.2% 0.252 263.5)
-
Step 800
800
#083CBE
oklch(42.7% 0.208 263.5)
-
Step 900
900 (this color)
#143C9C
oklch(39.6% 0.163 263.5)
-
Step 950
950
#0A2158
oklch(27% 0.104 263.7)
#143C9C 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) | #004A9F | 0.035 |
| Deuteranopia (no green cones) | #003E9A | 0.010 |
| Tritanopia (no blue cones) | #005566 | 0.125 |
| Achromatopsia (no color) | #444444 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #143C9C
#143C9C
oklch(39.6% 0.163 263.5)
- #5B4200
#5B4200
oklch(39.6% 0.081 84.1)
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 #143C9C, closest first.
No curated palette has a color within ΔE 0.04 of #143C9C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.028
- Cobalt #1E488F ΔE 0.041
- Twilight Blue #0A437A ΔE 0.061
- Blueberry #464196 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.070
- Light Navy #155084 ΔE 0.071
- Blue Blue #2242C7 ΔE 0.073
- Dusk Blue #26538D ΔE 0.073
Use #143C9C 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.