#181A3A
Closest named color: Rich Black (#0D1B2A). oklch(23.5% 0.061 278), rgb(24, 26, 58).
Aa
White text reads best on this color (16.83:1).
About this color
#181A3A is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.061 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.037 away. White text reads best on it, at 16.83:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.83:1 |
Values
| HEX | #181A3A |
| RGB | rgb(24, 26, 58) |
| HSL | hsl(236, 41%, 16%) |
| OKLCH | oklch(23.5% 0.061 278) |
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 #181A3A | 16.83:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #181A3A | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #181A3A text on white | 16.83:1 | AAA | Lc 103.7 | Preferred for body text |
| #181A3A 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
#D2D7F4
oklch(88.4% 0.04 277.8)
-
Step 300
300
#B5BDEF
oklch(80.9% 0.071 277.6)
-
Step 400
400
#9099E7
oklch(70.7% 0.114 278)
-
Step 500
500
#767EE0
oklch(63.1% 0.146 277.8)
-
Step 600
600
#6065CE
oklch(55.6% 0.159 277.8)
-
Step 700
700
#5053B2
oklch(49.1% 0.148 278.1)
-
Step 800
800
#414490
oklch(42.6% 0.123 278.1)
-
Step 900
900
#373A73
oklch(37.6% 0.096 278.5)
-
Step 950
950 (this color)
#181A3A
oklch(23.5% 0.061 278)
#181A3A 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) | #0C1F3B | 0.021 |
| Deuteranopia (no green cones) | #091C39 | 0.021 |
| Tritanopia (no blue cones) | #0A2127 | 0.053 |
| Achromatopsia (no color) | #1D1D1D | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181A3A
#181A3A
oklch(23.5% 0.061 278)
- #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 #181A3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.037
- Oxford Blue #1B263B ΔE 0.041
- Dark #1B2431 ΔE 0.042
- Navy Blue #001146 ΔE 0.053
- Jet #212529 ΔE 0.059
- Dark Indigo #1F0954 ΔE 0.062
- Midnight Purple #280137 ΔE 0.068
- Very Dark Purple #2A0134 ΔE 0.071
Use #181A3A 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.