#183665
Closest named color: Marine Blue (#01386A). oklch(33.7% 0.09 259.1), rgb(24, 54, 101).
Aa
White text reads best on this color (11.96:1).
About this color
#183665 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.090 and its hue 259°. 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 11.96:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.96:1 |
Values
| HEX | #183665 |
| RGB | rgb(24, 54, 101) |
| HSL | hsl(217, 62%, 25%) |
| OKLCH | oklch(33.7% 0.09 259.1) |
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 #183665 | 11.96:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #183665 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #183665 text on white | 11.96:1 | AAA | Lc 97.1 | Preferred for body text |
| #183665 text on black | 1.75:1 | 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
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A7C2ED
oklch(80.9% 0.068 259.6)
-
Step 400
400
#77A2E4
oklch(70.8% 0.108 258.7)
-
Step 500
500
#5489DC
oklch(63.2% 0.138 259)
-
Step 600
600
#3871CA
oklch(55.7% 0.151 259.1)
-
Step 700
700
#2A5EAE
oklch(49.1% 0.139 258.9)
-
Step 800
800
#244D8D
oklch(42.6% 0.116 259.1)
-
Step 900
900 (this color)
#183665
oklch(33.7% 0.09 259.1)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#183665 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) | #1F3A67 | 0.016 |
| Deuteranopia (no green cones) | #113364 | 0.012 |
| Tritanopia (no blue cones) | #004148 | 0.072 |
| Achromatopsia (no color) | #373737 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183665
#183665
oklch(33.7% 0.09 259.1)
- #4A3200
#4A3200
oklch(33.7% 0.07 79.3)
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 #183665, 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 0.025
- Marine #042E60 ΔE 0.032
- Twilight Blue #0A437A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Midnight Green #073B4C ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.063
- Gunmetal #293241 ΔE 0.064
Use #183665 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.