#183866
Closest named color: Marine Blue (#01386A). oklch(34.3% 0.089 257.8), rgb(24, 56, 102).
Aa
White text reads best on this color (11.69:1).
About this color
#183866 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.089 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.016 away. White text reads best on it, at 11.69:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #183866 |
| RGB | rgb(24, 56, 102) |
| HSL | hsl(215, 62%, 25%) |
| OKLCH | oklch(34.3% 0.089 257.8) |
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 #183866 | 11.69:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #183866 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #183866 text on white | 11.69:1 | AAA | Lc 96.6 | Preferred for body text |
| #183866 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADAF2
oklch(88.4% 0.037 258.4)
-
Step 300
300
#A6C3EC
oklch(81% 0.066 257)
-
Step 400
400
#76A2E3
oklch(70.7% 0.107 258)
-
Step 500
500
#528ADB
oklch(63.2% 0.136 257.7)
-
Step 600
600
#3572C8
oklch(55.6% 0.148 257.5)
-
Step 700
700
#285FAD
oklch(49.1% 0.137 257.8)
-
Step 800
800
#224E8C
oklch(42.7% 0.114 257.5)
-
Step 900
900 (this color)
#183866
oklch(34.3% 0.089 257.8)
-
Step 950
950
#142642
oklch(26.9% 0.058 258.9)
#183866 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) | #223C68 | 0.018 |
| Deuteranopia (no green cones) | #143565 | 0.011 |
| Tritanopia (no blue cones) | #00434A | 0.070 |
| Achromatopsia (no color) | #383838 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183866
#183866
oklch(34.3% 0.089 257.8)
- #4D3300
#4D3300
oklch(34.3% 0.072 77.5)
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 #183866, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Prussian Blue #1D3557 ΔE 0.026
- Marine #042E60 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.048
- Midnight Green #073B4C ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.058
- Charcoal #264653 ΔE 0.065
Use #183866 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.