#183671
Closest named color: Marine Blue (#01386A). oklch(34.7% 0.108 262.1), rgb(24, 54, 113).
Aa
White text reads best on this color (11.63:1).
About this color
#183671 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.108 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.020 away. White text reads best on it, at 11.63:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.63:1 |
Values
| HEX | #183671 |
| RGB | rgb(24, 54, 113) |
| HSL | hsl(220, 65%, 27%) |
| OKLCH | oklch(34.7% 0.108 262.1) |
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 #183671 | 11.63:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #183671 | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #183671 text on white | 11.63:1 | AAA | Lc 96.4 | Preferred for body text |
| #183671 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F6
oklch(80.8% 0.082 262.3)
-
Step 400
400
#739FF1
oklch(70.6% 0.13 262.1)
-
Step 500
500
#4F85ED
oklch(63.1% 0.167 262.1)
-
Step 600
600
#346CDB
oklch(55.6% 0.18 262.1)
-
Step 700
700
#2759BE
oklch(49% 0.168 262.3)
-
Step 800
800
#214A9A
oklch(42.8% 0.139 262)
-
Step 900
900 (this color)
#183671
oklch(34.7% 0.108 262.1)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#183671 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) | #133D73 | 0.020 |
| Deuteranopia (no green cones) | #003570 | 0.017 |
| Tritanopia (no blue cones) | #00444E | 0.085 |
| Achromatopsia (no color) | #393939 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183671
#183671
oklch(34.7% 0.108 262.1)
- #4C3500
#4C3500
oklch(34.6% 0.071 81.7)
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 #183671, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.020
- Twilight Blue #0A437A ΔE 0.039
- Marine #042E60 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.069
- Cobalt #1E488F ΔE 0.070
- Midnight Blue #191970 ΔE 0.072
- Midnight Green #073B4C ΔE 0.072
Use #183671 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.