#181F2A
Closest named color: Dark (#1B2431). oklch(23.8% 0.024 259.3), rgb(24, 31, 42).
Aa
White text reads best on this color (16.55:1).
About this color
#181F2A is a very dark close to neutral grey. In OKLCH its lightness is 24%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Dark (#1B2431), ΔE 0.021 away. White text reads best on it, at 16.55:1.
| Hue family | Neutrals |
| Lightness | very dark (24%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Dark (#1B2431) |
| Black text | 1.26:1 |
| White text | 16.55:1 |
Values
| HEX | #181F2A |
| RGB | rgb(24, 31, 42) |
| HSL | hsl(217, 27%, 13%) |
| OKLCH | oklch(23.8% 0.024 259.3) |
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 #181F2A | 16.55:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #181F2A | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #181F2A text on white | 16.55:1 | AAA | Lc 103.5 | Preferred for body text |
| #181F2A text on black | 1.26:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE4
oklch(88.6% 0.016 257.2)
-
Step 300
300
#B6C1D3
oklch(80.8% 0.028 260.3)
-
Step 400
400
#90A2BD
oklch(70.7% 0.045 258.4)
-
Step 500
500
#758BAD
oklch(63.2% 0.057 259)
-
Step 600
600
#5D7498
oklch(55.5% 0.063 259.2)
-
Step 700
700
#4D6182
oklch(49% 0.059 260.2)
-
Step 800
800
#3F5069
oklch(42.7% 0.047 257.9)
-
Step 900
900
#364256
oklch(37.7% 0.038 260.5)
-
Step 950
950 (this color)
#181F2A
oklch(23.8% 0.024 259.3)
#181F2A 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) | #1B202B | 0.007 |
| Deuteranopia (no green cones) | #191E2A | 0.004 |
| Tritanopia (no blue cones) | #122123 | 0.020 |
| Achromatopsia (no color) | #1F1F1F | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181F2A
#181F2A
oklch(23.8% 0.024 259.3)
- #251D12
#251D12
oklch(23.7% 0.023 75.1)
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 #181F2A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.021
- Rich Black #0D1B2A ΔE 0.024
- Jet #212529 ΔE 0.028
- Oxford Blue #1B263B ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.070
- Rich Navy #001219 ΔE 0.071
- Gunmetal #293241 ΔE 0.078
- Dark Brown #341C02 ΔE 0.079
Use #181F2A 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.