#181B2D
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.035 276), rgb(24, 27, 45).
Aa
White text reads best on this color (17.02:1).
About this color
#181B2D is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.035 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.019 away. White text reads best on it, at 17.02:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.02:1 |
Values
| HEX | #181B2D |
| RGB | rgb(24, 27, 45) |
| HSL | hsl(231, 30%, 14%) |
| OKLCH | oklch(22.8% 0.035 276) |
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 #181B2D | 17.02:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #181B2D | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #181B2D text on white | 17.02:1 | AAA | Lc 103.9 | Preferred for body text |
| #181B2D text on black | 1.23:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D5D8E9
oklch(88.5% 0.023 277.9)
-
Step 300
300
#B9BFDC
oklch(80.9% 0.041 276.2)
-
Step 400
400
#959ECB
oklch(70.8% 0.067 275.8)
-
Step 500
500
#7B85BD
oklch(63.1% 0.085 275.9)
-
Step 600
600
#656EA9
oklch(55.6% 0.092 276.4)
-
Step 700
700
#535C91
oklch(49.1% 0.086 275.5)
-
Step 800
800
#444B76
oklch(42.6% 0.072 275.9)
-
Step 900
900
#393F5F
oklch(37.7% 0.055 275.3)
-
Step 950
950 (this color)
#181B2D
oklch(22.8% 0.035 276)
#181B2D 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) | #151D2E | 0.008 |
| Deuteranopia (no green cones) | #141B2D | 0.007 |
| Tritanopia (no blue cones) | #121F21 | 0.033 |
| Achromatopsia (no color) | #1C1C1C | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181B2D
#181B2D
oklch(22.8% 0.035 276)
- #211C08
#211C08
oklch(22.7% 0.034 95.6)
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 #181B2D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.019
- Dark #1B2431 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.042
- Jet #212529 ΔE 0.043
- Rich Navy #001219 ΔE 0.067
- Navy Blue #001146 ΔE 0.071
- Space Cadet #2B2D42 ΔE 0.077
- Midnight Purple #280137 ΔE 0.079
Use #181B2D 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.