#183868
Closest named color: Marine Blue (#01386A). oklch(34.5% 0.092 258.5), rgb(24, 56, 104).
Aa
White text reads best on this color (11.63:1).
About this color
#183868 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.092 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.015 away. White text reads best on it, at 11.63:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.63:1 |
Values
| HEX | #183868 |
| RGB | rgb(24, 56, 104) |
| HSL | hsl(216, 63%, 25%) |
| OKLCH | oklch(34.5% 0.092 258.5) |
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 #183868 | 11.63:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #183868 | 1.80:1 | Fails | Lc 7.4 | Not readable |
| #183868 text on white | 11.63:1 | AAA | Lc 96.5 | Preferred for body text |
| #183868 text on black | 1.80:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A6C2EE
oklch(80.9% 0.07 259.3)
-
Step 400
400
#75A2E5
oklch(70.7% 0.11 258.1)
-
Step 500
500
#5189DE
oklch(63.1% 0.142 258.5)
-
Step 600
600
#3471CB
oklch(55.6% 0.153 258.3)
-
Step 700
700
#275EB0
oklch(49.1% 0.143 258.6)
-
Step 800
800
#224D8E
oklch(42.6% 0.118 258.6)
-
Step 900
900 (this color)
#183868
oklch(34.5% 0.092 258.5)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#183868 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) | #203C6A | 0.016 |
| Deuteranopia (no green cones) | #123567 | 0.011 |
| Tritanopia (no blue cones) | #00434B | 0.071 |
| Achromatopsia (no color) | #383838 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183868
#183868
oklch(34.5% 0.092 258.5)
- #4D3400
#4D3400
oklch(34.5% 0.072 79)
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 #183868, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.015
- Prussian Blue #1D3557 ΔE 0.030
- Marine #042E60 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.051
- Midnight Green #073B4C ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.059
- Charcoal #264653 ΔE 0.067
Use #183868 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.