#183D65
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.082 252.6), rgb(24, 61, 101).
Aa
White text reads best on this color (11.08:1).
About this color
#183D65 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.082 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.08:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.89:1 |
| White text | 11.08:1 |
Values
| HEX | #183D65 |
| RGB | rgb(24, 61, 101) |
| HSL | hsl(211, 62%, 25%) |
| OKLCH | oklch(35.5% 0.082 252.6) |
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 #183D65 | 11.08:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #183D65 | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #183D65 text on white | 11.08:1 | AAA | Lc 95.4 | Preferred for body text |
| #183D65 text on black | 1.89:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF0
oklch(88.5% 0.034 253.7)
-
Step 300
300
#A5C4E8
oklch(81% 0.061 252.4)
-
Step 400
400
#74A4DC
oklch(70.7% 0.097 252.9)
-
Step 500
500
#4D8CD3
oklch(63% 0.126 252.9)
-
Step 600
600
#2E75C0
oklch(55.6% 0.136 252.6)
-
Step 700
700
#2162A6
oklch(49.1% 0.127 252.8)
-
Step 800
800
#1D5086
oklch(42.6% 0.105 252.7)
-
Step 900
900 (this color)
#183D65
oklch(35.5% 0.082 252.6)
-
Step 950
950
#13273F
oklch(26.9% 0.052 254)
#183D65 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) | #2B4067 | 0.024 |
| Deuteranopia (no green cones) | #1F3864 | 0.016 |
| Tritanopia (no blue cones) | #00464C | 0.061 |
| Achromatopsia (no color) | #3C3C3C | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183D65
#183D65
oklch(35.5% 0.082 252.6)
- #543400
#543400
oklch(35.5% 0.076 71.8)
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 #183D65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.031
- Twilight Blue #0A437A ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
- Midnight Green #073B4C ΔE 0.047
- Charcoal #264653 ΔE 0.051
- Marine #042E60 ΔE 0.052
Use #183D65 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.