#18374C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(32.4% 0.053 240.7), rgb(24, 55, 76).
Aa
White text reads best on this color (12.42:1).
About this color
#18374C is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.053 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.016 away. White text reads best on it, at 12.42:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.68:1 |
| White text | 12.42:1 |
Values
| HEX | #18374C |
| RGB | rgb(24, 55, 76) |
| HSL | hsl(204, 52%, 20%) |
| OKLCH | oklch(32.4% 0.053 240.7) |
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 #18374C | 12.42:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #18374C | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #18374C text on white | 12.42:1 | AAA | Lc 98.1 | Preferred for body text |
| #18374C text on black | 1.68:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC5D8
oklch(81% 0.039 239.7)
-
Step 400
400
#7DA6C5
oklch(70.7% 0.064 241.4)
-
Step 500
500
#5B90B6
oklch(63.1% 0.081 240.9)
-
Step 600
600
#3F7AA2
oklch(55.7% 0.088 240.5)
-
Step 700
700
#31668A
oklch(49% 0.081 240.8)
-
Step 800
800
#295470
oklch(42.8% 0.067 239.5)
-
Step 900
900 (this color)
#18374C
oklch(32.4% 0.053 240.7)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#18374C 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) | #2E374D | 0.028 |
| Deuteranopia (no green cones) | #26324C | 0.022 |
| Tritanopia (no blue cones) | #003C3E | 0.039 |
| Achromatopsia (no color) | #343434 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18374C
#18374C
oklch(32.4% 0.053 240.7)
- #472D16
#472D16
oklch(32.3% 0.052 60.8)
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 #18374C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.016
- Midnight Green #073B4C ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.023
- Gunmetal #293241 ΔE 0.028
- Space Cadet #2B2D42 ΔE 0.038
- Onyx #343A40 ΔE 0.045
- Marine #042E60 ΔE 0.053
- Marine Blue #01386A ΔE 0.054
Use #18374C 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.