#183E68
Closest named color: Marine Blue (#01386A). oklch(36% 0.085 253.2), rgb(24, 62, 104).
Aa
White text reads best on this color (10.89:1).
About this color
#183E68 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.085 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.026 away. White text reads best on it, at 10.89:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.92:1 |
| White text | 10.89:1 |
Values
| HEX | #183E68 |
| RGB | rgb(24, 62, 104) |
| HSL | hsl(212, 63%, 25%) |
| OKLCH | oklch(36% 0.085 253.2) |
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 #183E68 | 10.89:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #183E68 | 1.92:1 | Fails | Lc 9.0 | Not readable |
| #183E68 text on white | 10.89:1 | AAA | Lc 95.0 | Preferred for body text |
| #183E68 text on black | 1.92:1 | Fails | Lc -7.7 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C4E9
oklch(80.9% 0.063 252.3)
-
Step 400
400
#72A4DF
oklch(70.7% 0.102 253.2)
-
Step 500
500
#4B8CD6
oklch(63.1% 0.131 253.2)
-
Step 600
600
#2C75C3
oklch(55.7% 0.141 253)
-
Step 700
700
#1E62A8
oklch(49.2% 0.13 252.8)
-
Step 800
800
#1B5088
oklch(42.7% 0.108 252.9)
-
Step 900
900 (this color)
#183E68
oklch(36% 0.085 253.2)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#183E68 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) | #2B416A | 0.024 |
| Deuteranopia (no green cones) | #1E3967 | 0.015 |
| Tritanopia (no blue cones) | #00484E | 0.065 |
| Achromatopsia (no color) | #3D3D3D | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183E68
#183E68
oklch(36% 0.085 253.2)
- #553600
#553600
oklch(36.1% 0.077 73.7)
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 #183E68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.026
- Twilight Blue #0A437A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.046
- Midnight Green #073B4C ΔE 0.052
- Charcoal #264653 ΔE 0.052
- Marine #042E60 ΔE 0.055
Use #183E68 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.