#181D23
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.014 253.1), rgb(24, 29, 35).
Aa
White text reads best on this color (16.95:1).
About this color
#181D23 is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.014. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.024 away. White text reads best on it, at 16.95:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.014) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.95:1 |
Values
| HEX | #181D23 |
| RGB | rgb(24, 29, 35) |
| HSL | hsl(213, 19%, 12%) |
| OKLCH | oklch(22.8% 0.014 253.1) |
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 #181D23 | 16.95:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #181D23 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #181D23 text on white | 16.95:1 | AAA | Lc 103.9 | Preferred for body text |
| #181D23 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#B9C1CB
oklch(80.8% 0.017 253.9)
-
Step 400
400
#95A2B1
oklch(70.7% 0.026 252)
-
Step 500
500
#7B8B9E
oklch(63.1% 0.034 252.8)
-
Step 600
600
#657589
oklch(55.7% 0.037 254.1)
-
Step 700
700
#536274
oklch(49% 0.034 253.2)
-
Step 800
800
#44505E
oklch(42.6% 0.028 252.4)
-
Step 900
900
#3A424D
oklch(37.6% 0.022 256.4)
-
Step 950
950 (this color)
#181D23
oklch(22.8% 0.014 253.1)
#181D23 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) | #1B1D23 | 0.005 |
| Deuteranopia (no green cones) | #1A1C23 | 0.005 |
| Tritanopia (no blue cones) | #151E1F | 0.011 |
| Achromatopsia (no color) | #1C1C1C | 0.014 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #181D23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.024
- Dark #1B2431 ΔE 0.033
- Jet #212529 ΔE 0.034
- Oxford Blue #1B263B ΔE 0.050
- Rich Navy #001219 ΔE 0.063
- Dark Brown #341C02 ΔE 0.072
- Almost Black #070D0D ΔE 0.077
- Space Cadet #2B2D42 ΔE 0.081
Use #181D23 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.