#181B3D
Closest named color: Oxford Blue (#1B263B). oklch(24% 0.064 276.6), rgb(24, 27, 61).
Aa
White text reads best on this color (16.62:1).
About this color
#181B3D is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.064 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.039 away. White text reads best on it, at 16.62:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.62:1 |
Values
| HEX | #181B3D |
| RGB | rgb(24, 27, 61) |
| HSL | hsl(235, 44%, 17%) |
| OKLCH | oklch(24% 0.064 276.6) |
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 #181B3D | 16.62:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #181B3D | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #181B3D text on white | 16.62:1 | AAA | Lc 103.5 | Preferred for body text |
| #181B3D text on black | 1.26:1 | 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
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF2
oklch(80.9% 0.076 276.3)
-
Step 400
400
#8D99EC
oklch(70.7% 0.122 276.5)
-
Step 500
500
#737DE5
oklch(63% 0.155 276.8)
-
Step 600
600
#5D64D4
oklch(55.7% 0.169 276.7)
-
Step 700
700
#4D52B7
oklch(49.1% 0.157 276.8)
-
Step 800
800
#3F4494
oklch(42.7% 0.129 276.7)
-
Step 900
900
#353A76
oklch(37.7% 0.101 276.8)
-
Step 950
950 (this color)
#181B3D
oklch(24% 0.064 276.6)
#181B3D 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) | #0B203E | 0.022 |
| Deuteranopia (no green cones) | #071D3C | 0.023 |
| Tritanopia (no blue cones) | #082229 | 0.055 |
| Achromatopsia (no color) | #1E1E1E | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181B3D
#181B3D
oklch(24% 0.064 276.6)
- #261F00
#261F00
oklch(24% 0.05 96.9)
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 #181B3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.039
- Rich Black #0D1B2A ΔE 0.042
- Dark #1B2431 ΔE 0.043
- Navy Blue #001146 ΔE 0.052
- Dark Indigo #1F0954 ΔE 0.059
- Jet #212529 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.070
- Midnight Purple #280137 ΔE 0.070
Use #181B3D 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.