#183368
Closest named color: Marine Blue (#01386A). oklch(33.2% 0.099 262.2), rgb(24, 51, 104).
Aa
White text reads best on this color (12.26:1).
About this color
#183368 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.099 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.019 away. White text reads best on it, at 12.26:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.26:1 |
Values
| HEX | #183368 |
| RGB | rgb(24, 51, 104) |
| HSL | hsl(220, 63%, 25%) |
| OKLCH | oklch(33.2% 0.099 262.2) |
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 #183368 | 12.26:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #183368 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #183368 text on white | 12.26:1 | AAA | Lc 97.7 | Preferred for body text |
| #183368 text on black | 1.71:1 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A7C1F1
oklch(80.8% 0.074 262.5)
-
Step 400
400
#78A0EB
oklch(70.8% 0.119 262.3)
-
Step 500
500
#5586E4
oklch(63% 0.152 262.2)
-
Step 600
600
#3B6ED2
oklch(55.7% 0.164 262.2)
-
Step 700
700
#2D5BB6
oklch(49.1% 0.153 262.2)
-
Step 800
800
#264B93
oklch(42.7% 0.126 262.1)
-
Step 900
900 (this color)
#183368
oklch(33.2% 0.099 262.2)
-
Step 950
950
#152545
oklch(26.9% 0.064 262.8)
#183368 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) | #16396A | 0.018 |
| Deuteranopia (no green cones) | #013267 | 0.018 |
| Tritanopia (no blue cones) | #004048 | 0.080 |
| Achromatopsia (no color) | #353535 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183368
#183368
oklch(33.2% 0.099 262.2)
- #473200
#473200
oklch(33.3% 0.068 82.8)
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 #183368, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.019
- Marine #042E60 ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.032
- Twilight Blue #0A437A ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.060
- Midnight Green #073B4C ΔE 0.062
- Midnight Blue #191970 ΔE 0.067
- Space Cadet #2B2D42 ΔE 0.069
Use #183368 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.