#181C3C
Closest named color: Oxford Blue (#1B263B). oklch(24.2% 0.061 275.5), rgb(24, 28, 60).
Aa
White text reads best on this color (16.53:1).
About this color
#181C3C is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.061 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.035 away. White text reads best on it, at 16.53:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.53:1 |
Values
| HEX | #181C3C |
| RGB | rgb(24, 28, 60) |
| HSL | hsl(233, 43%, 16%) |
| OKLCH | oklch(24.2% 0.061 275.5) |
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 #181C3C | 16.53:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #181C3C | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #181C3C text on white | 16.53:1 | AAA | Lc 103.4 | Preferred for body text |
| #181C3C text on black | 1.27:1 | 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 950.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B3BDF0
oklch(80.8% 0.073 276)
-
Step 400
400
#8C9AE8
oklch(70.7% 0.115 275.3)
-
Step 500
500
#727FE1
oklch(63.1% 0.147 275.7)
-
Step 600
600
#5B66CF
oklch(55.6% 0.16 275.4)
-
Step 700
700
#4B54B3
oklch(49% 0.149 275.4)
-
Step 800
800
#3E4591
oklch(42.6% 0.124 275.9)
-
Step 900
900
#343B74
oklch(37.7% 0.097 275.5)
-
Step 950
950 (this color)
#181C3C
oklch(24.2% 0.061 275.5)
#181C3C 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) | #0E203D | 0.017 |
| Deuteranopia (no green cones) | #0A1D3B | 0.019 |
| Tritanopia (no blue cones) | #082329 | 0.053 |
| Achromatopsia (no color) | #1F1F1F | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181C3C
#181C3C
oklch(24.2% 0.061 275.5)
- #271F00
#271F00
oklch(24.2% 0.05 95.1)
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 #181C3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.035
- Dark #1B2431 ΔE 0.039
- Rich Black #0D1B2A ΔE 0.040
- Navy Blue #001146 ΔE 0.055
- Jet #212529 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.063
- Space Cadet #2B2D42 ΔE 0.067
- Midnight Purple #280137 ΔE 0.073
Use #181C3C 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.