#181B30
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.041 276.5), rgb(24, 27, 48).
Aa
White text reads best on this color (16.95:1).
About this color
#181B30 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.041 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 16.95:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.95:1 |
Values
| HEX | #181B30 |
| RGB | rgb(24, 27, 48) |
| HSL | hsl(233, 33%, 14%) |
| OKLCH | oklch(23% 0.041 276.5) |
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 #181B30 | 16.95:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #181B30 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #181B30 text on white | 16.95:1 | AAA | Lc 103.8 | Preferred for body text |
| #181B30 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B8BFE0
oklch(81% 0.047 275.9)
-
Step 400
400
#949DD1
oklch(70.8% 0.077 276.6)
-
Step 500
500
#7A84C5
oklch(63.2% 0.098 276.5)
-
Step 600
600
#636CB2
oklch(55.5% 0.109 276.7)
-
Step 700
700
#525A99
oklch(49% 0.101 276.5)
-
Step 800
800
#434A7C
oklch(42.7% 0.083 276.2)
-
Step 900
900
#393E64
oklch(37.7% 0.065 277.1)
-
Step 950
950 (this color)
#181B30
oklch(23% 0.041 276.5)
#181B30 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) | #141D31 | 0.009 |
| Deuteranopia (no green cones) | #121C30 | 0.010 |
| Tritanopia (no blue cones) | #101F23 | 0.035 |
| Achromatopsia (no color) | #1C1C1C | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181B30
#181B30
oklch(23% 0.041 276.5)
- #231D04
#231D04
oklch(23.1% 0.041 96.1)
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 #181B30, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Dark #1B2431 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.040
- Jet #212529 ΔE 0.046
- Navy Blue #001146 ΔE 0.066
- Rich Navy #001219 ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.075
- Midnight Purple #280137 ΔE 0.076
Use #181B30 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.