#183375
Closest named color: Marine Blue (#01386A). oklch(34.3% 0.118 264.3), rgb(24, 51, 117).
Aa
White text reads best on this color (11.86:1).
About this color
#183375 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.118 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.029 away. White text reads best on it, at 11.86:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.86:1 |
Values
| HEX | #183375 |
| RGB | rgb(24, 51, 117) |
| HSL | hsl(223, 66%, 28%) |
| OKLCH | oklch(34.3% 0.118 264.3) |
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 #183375 | 11.86:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #183375 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #183375 text on white | 11.86:1 | AAA | Lc 96.8 | Preferred for body text |
| #183375 text on black | 1.76:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9DAFB
oklch(88.6% 0.049 263.7)
-
Step 300
300
#A4C0FB
oklch(80.8% 0.089 264.8)
-
Step 400
400
#739EF9
oklch(70.8% 0.142 264)
-
Step 500
500
#5082F6
oklch(63.1% 0.182 264.3)
-
Step 600
600
#3668E5
oklch(55.6% 0.198 264.4)
-
Step 700
700
#2956C7
oklch(49.2% 0.183 264.2)
-
Step 800
800
#2247A1
oklch(42.8% 0.152 264.1)
-
Step 900
900 (this color)
#183375
oklch(34.3% 0.118 264.3)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#183375 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) | #003C77 | 0.026 |
| Deuteranopia (no green cones) | #003374 | 0.016 |
| Tritanopia (no blue cones) | #00434E | 0.094 |
| Achromatopsia (no color) | #373737 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183375
#183375
oklch(34.3% 0.118 264.3)
- #4A3500
#4A3500
oklch(34.4% 0.071 84)
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 #183375, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.029
- Marine #042E60 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.054
- Midnight Blue #191970 ΔE 0.064
- Cobalt #1E488F ΔE 0.072
- Royal #0C1793 ΔE 0.077
- Dark Blue Grey #1F3B4D ΔE 0.079
Use #183375 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.