#181B2E
Closest named color: Rich Black (#0D1B2A). oklch(22.9% 0.037 276.2), rgb(24, 27, 46).
Aa
White text reads best on this color (17.00:1).
About this color
#181B2E is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.037 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 17.00:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.00:1 |
Values
| HEX | #181B2E |
| RGB | rgb(24, 27, 46) |
| HSL | hsl(232, 31%, 14%) |
| OKLCH | oklch(22.9% 0.037 276.2) |
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 #181B2E | 17.00:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #181B2E | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #181B2E text on white | 17.00:1 | AAA | Lc 103.9 | Preferred for body text |
| #181B2E 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EA
oklch(88.5% 0.025 275.9)
-
Step 300
300
#B8BFDE
oklch(80.9% 0.044 275.3)
-
Step 400
400
#949DCD
oklch(70.6% 0.071 276.2)
-
Step 500
500
#7B85C0
oklch(63.2% 0.09 276.1)
-
Step 600
600
#646EAC
oklch(55.7% 0.097 275.8)
-
Step 700
700
#535B94
oklch(49% 0.092 276.4)
-
Step 800
800
#444B78
oklch(42.8% 0.075 276)
-
Step 900
900
#393F61
oklch(37.8% 0.059 275.6)
-
Step 950
950 (this color)
#181B2E
oklch(22.9% 0.037 276.2)
#181B2E 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) | #151D2F | 0.008 |
| Deuteranopia (no green cones) | #131B2E | 0.008 |
| Tritanopia (no blue cones) | #111F22 | 0.033 |
| Achromatopsia (no color) | #1C1C1C | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181B2E
#181B2E
oklch(22.9% 0.037 276.2)
- #221D06
#221D06
oklch(23.1% 0.038 97.3)
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 #181B2E, 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 0.041
- Jet #212529 ΔE 0.044
- Rich Navy #001219 ΔE 0.068
- Navy Blue #001146 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.076
- Midnight Purple #280137 ΔE 0.078
Use #181B2E 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.