#181C2F
Closest named color: Rich Black (#0D1B2A). oklch(23.2% 0.037 274.1), rgb(24, 28, 47).
Aa
White text reads best on this color (16.85:1).
About this color
#181C2F is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.037 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 16.85:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.85:1 |
Values
| HEX | #181C2F |
| RGB | rgb(24, 28, 47) |
| HSL | hsl(230, 32%, 14%) |
| OKLCH | oklch(23.2% 0.037 274.1) |
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 #181C2F | 16.85:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #181C2F | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #181C2F text on white | 16.85:1 | AAA | Lc 103.7 | Preferred for body text |
| #181C2F text on black | 1.24:1 | 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
#B7BFDE
oklch(80.8% 0.045 273.9)
-
Step 400
400
#939ECD
oklch(70.8% 0.07 274.3)
-
Step 500
500
#7885C0
oklch(63% 0.09 274)
-
Step 600
600
#626EAD
oklch(55.6% 0.099 274.5)
-
Step 700
700
#515C94
oklch(49.1% 0.091 274.2)
-
Step 800
800
#424B78
oklch(42.6% 0.076 274.2)
-
Step 900
900
#383F61
oklch(37.7% 0.059 274.4)
-
Step 950
950 (this color)
#181C2F
oklch(23.2% 0.037 274.1)
#181C2F 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) | #161E30 | 0.007 |
| Deuteranopia (no green cones) | #141C2F | 0.007 |
| Tritanopia (no blue cones) | #112023 | 0.033 |
| Achromatopsia (no color) | #1D1D1D | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181C2F
#181C2F
oklch(23.2% 0.037 274.1)
- #231D07
#231D07
oklch(23.2% 0.037 94.3)
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 #181C2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Dark #1B2431 ΔE 0.029
- Oxford Blue #1B263B ΔE 0.038
- Jet #212529 ΔE 0.042
- Navy Blue #001146 ΔE 0.070
- Rich Navy #001219 ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.073
- Midnight Purple #280137 ΔE 0.080
Use #181C2F 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.