#181A39
Closest named color: Rich Black (#0D1B2A). oklch(23.4% 0.059 278), rgb(24, 26, 57).
Aa
White text reads best on this color (16.85:1).
About this color
#181A39 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.059 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.036 away. White text reads best on it, at 16.85:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.85:1 |
Values
| HEX | #181A39 |
| RGB | rgb(24, 26, 57) |
| HSL | hsl(236, 41%, 16%) |
| OKLCH | oklch(23.4% 0.059 278) |
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 #181A39 | 16.85:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #181A39 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #181A39 text on white | 16.85:1 | AAA | Lc 103.7 | Preferred for body text |
| #181A39 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B6BDEE
oklch(81% 0.07 278.4)
-
Step 400
400
#9099E5
oklch(70.6% 0.111 278)
-
Step 500
500
#777EDE
oklch(63.1% 0.143 278.3)
-
Step 600
600
#6165CB
oklch(55.5% 0.155 278.4)
-
Step 700
700
#5054B0
oklch(49.2% 0.144 277.8)
-
Step 800
800
#41458E
oklch(42.6% 0.119 277.7)
-
Step 900
900
#373B72
oklch(37.8% 0.093 277.8)
-
Step 950
950 (this color)
#181A39
oklch(23.4% 0.059 278)
#181A39 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) | #0D1E3A | 0.019 |
| Deuteranopia (no green cones) | #0A1C38 | 0.020 |
| Tritanopia (no blue cones) | #0B2126 | 0.053 |
| Achromatopsia (no color) | #1D1D1D | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181A39
#181A39
oklch(23.4% 0.059 278)
- #241E00
#241E00
oklch(23.5% 0.049 98.6)
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 #181A39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.036
- Oxford Blue #1B263B ΔE 0.041
- Dark #1B2431 ΔE 0.041
- Navy Blue #001146 ΔE 0.054
- Jet #212529 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.064
- Midnight Purple #280137 ΔE 0.068
- Very Dark Purple #2A0134 ΔE 0.071
Use #181A39 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.