#183D67
Closest named color: Marine Blue (#01386A). oklch(35.6% 0.084 253.6), rgb(24, 61, 103).
Aa
White text reads best on this color (11.03:1).
About this color
#183D67 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.084 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.024 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #183D67 |
| RGB | rgb(24, 61, 103) |
| HSL | hsl(212, 62%, 25%) |
| OKLCH | oklch(35.6% 0.084 253.6) |
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 #183D67 | 11.03:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #183D67 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #183D67 text on white | 11.03:1 | AAA | Lc 95.3 | Preferred for body text |
| #183D67 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A5C4E9
oklch(81% 0.062 253.1)
-
Step 400
400
#73A4DF
oklch(70.8% 0.102 253.7)
-
Step 500
500
#4D8CD6
oklch(63.2% 0.13 253.8)
-
Step 600
600
#2E74C3
oklch(55.5% 0.141 253.9)
-
Step 700
700
#2061A8
oklch(49% 0.131 253.7)
-
Step 800
800
#1D5088
oklch(42.8% 0.108 253.4)
-
Step 900
900 (this color)
#183D67
oklch(35.6% 0.084 253.6)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#183D67 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) | #2A4069 | 0.023 |
| Deuteranopia (no green cones) | #1D3966 | 0.012 |
| Tritanopia (no blue cones) | #00474D | 0.065 |
| Achromatopsia (no color) | #3C3C3C | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183D67
#183D67
oklch(35.6% 0.084 253.6)
- #533500
#533500
oklch(35.6% 0.075 74.2)
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 #183D67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.024
- Prussian Blue #1D3557 ΔE 0.034
- Twilight Blue #0A437A ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.045
- Midnight Green #073B4C ΔE 0.051
- Marine #042E60 ΔE 0.052
- Charcoal #264653 ΔE 0.053
Use #183D67 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.