#181B25
Closest named color: Rich Black (#0D1B2A). oklch(22.4% 0.02 271.7), rgb(24, 27, 37).
Aa
White text reads best on this color (17.18:1).
About this color
#181B25 is a very dark close to neutral grey. In OKLCH its lightness is 22%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.019 away. White text reads best on it, at 17.18:1.
| Hue family | Neutrals |
| Lightness | very dark (22%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.18:1 |
Values
| HEX | #181B25 |
| RGB | rgb(24, 27, 37) |
| HSL | hsl(226, 21%, 12%) |
| OKLCH | oklch(22.4% 0.02 271.7) |
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 #181B25 | 17.18:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #181B25 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #181B25 text on white | 17.18:1 | AAA | Lc 104.1 | Preferred for body text |
| #181B25 text on black | 1.22:1 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D6D9E2
oklch(88.6% 0.013 271.3)
-
Step 300
300
#BBC0D0
oklch(80.9% 0.023 272)
-
Step 400
400
#98A0B9
oklch(70.8% 0.038 271.4)
-
Step 500
500
#7F88A8
oklch(63.1% 0.049 272.6)
-
Step 600
600
#687293
oklch(55.6% 0.053 271.5)
-
Step 700
700
#575F7D
oklch(49.1% 0.049 272.9)
-
Step 800
800
#474E66
oklch(42.7% 0.041 271.9)
-
Step 900
900
#3B4153
oklch(37.7% 0.032 270.4)
-
Step 950
950 (this color)
#181B25
oklch(22.4% 0.02 271.7)
#181B25 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) | #181C25 | 0.004 |
| Deuteranopia (no green cones) | #171B25 | 0.002 |
| Tritanopia (no blue cones) | #151D1E | 0.019 |
| Achromatopsia (no color) | #1B1B1B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181B25
#181B25
oklch(22.4% 0.02 271.7)
- #1F1B11
#1F1B11
oklch(22.3% 0.019 88.7)
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 #181B25, 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 0.036
- Jet #212529 ΔE 0.040
- Oxford Blue #1B263B ΔE 0.051
- Rich Navy #001219 ΔE 0.060
- Almost Black #070D0D ΔE 0.074
- Dark Brown #341C02 ΔE 0.078
- Space Cadet #2B2D42 ΔE 0.083
Use #181B25 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.