#183A4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.2% 0.051 234.3), rgb(24, 58, 76).
Aa
White text reads best on this color (12.01:1).
About this color
#183A4C is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.051 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.009 away. White text reads best on it, at 12.01:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.74:1 |
| White text | 12.01:1 |
Values
| HEX | #183A4C |
| RGB | rgb(24, 58, 76) |
| HSL | hsl(201, 52%, 20%) |
| OKLCH | oklch(33.2% 0.051 234.3) |
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 #183A4C | 12.01:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #183A4C | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #183A4C text on white | 12.01:1 | AAA | Lc 97.3 | Preferred for body text |
| #183A4C text on black | 1.74:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CCDCE5
oklch(88.5% 0.021 232.2)
-
Step 300
300
#AAC5D6
oklch(80.9% 0.038 235.6)
-
Step 400
400
#7BA7C1
oklch(70.6% 0.061 234.7)
-
Step 500
500
#5891B2
oklch(63% 0.078 235.3)
-
Step 600
600
#3B7B9D
oklch(55.5% 0.084 234.3)
-
Step 700
700
#2C6887
oklch(49.2% 0.079 234.2)
-
Step 800
800
#26556D
oklch(42.8% 0.065 233.3)
-
Step 900
900 (this color)
#183A4C
oklch(33.2% 0.051 234.3)
-
Step 950
950
#162934
oklch(27% 0.032 235.1)
#183A4C 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) | #31394D | 0.032 |
| Deuteranopia (no green cones) | #2A344C | 0.028 |
| Tritanopia (no blue cones) | #003F40 | 0.035 |
| Achromatopsia (no color) | #363636 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183A4C
#183A4C
oklch(33.2% 0.051 234.3)
- #4A2E1C
#4A2E1C
oklch(33.1% 0.05 52.9)
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 #183A4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.009
- Midnight Green #073B4C ΔE 0.012
- Prussian Blue #1D3557 ΔE 0.029
- Gunmetal #293241 ΔE 0.032
- Onyx #343A40 ΔE 0.040
- Charcoal #264653 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.049
Use #183A4C 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.