#181A3B
Closest named color: Rich Black (#0D1B2A). oklch(23.6% 0.062 277.9), rgb(24, 26, 59).
Aa
White text reads best on this color (16.80:1).
About this color
#181A3B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.062 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.039 away. White text reads best on it, at 16.80:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.80:1 |
Values
| HEX | #181A3B |
| RGB | rgb(24, 26, 59) |
| HSL | hsl(237, 42%, 16%) |
| OKLCH | oklch(23.6% 0.062 277.9) |
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 #181A3B | 16.80:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #181A3B | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #181A3B text on white | 16.80:1 | AAA | Lc 103.6 | Preferred for body text |
| #181A3B 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
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B5BDF1
oklch(81% 0.074 277.8)
-
Step 400
400
#8F99E9
oklch(70.7% 0.117 277.5)
-
Step 500
500
#757DE3
oklch(63.1% 0.152 277.7)
-
Step 600
600
#6064D1
oklch(55.7% 0.165 278)
-
Step 700
700
#4F52B5
oklch(49.1% 0.154 277.8)
-
Step 800
800
#414492
oklch(42.7% 0.126 278)
-
Step 900
900
#363A75
oklch(37.7% 0.099 277.6)
-
Step 950
950 (this color)
#181A3B
oklch(23.6% 0.062 277.9)
#181A3B 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) | #0B1F3C | 0.022 |
| Deuteranopia (no green cones) | #071C3A | 0.023 |
| Tritanopia (no blue cones) | #092127 | 0.055 |
| Achromatopsia (no color) | #1D1D1D | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181A3B
#181A3B
oklch(23.6% 0.062 277.9)
- #251E00
#251E00
oklch(23.6% 0.049 96.6)
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 #181A3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.039
- Oxford Blue #1B263B ΔE 0.041
- Dark #1B2431 ΔE 0.043
- Navy Blue #001146 ΔE 0.052
- Jet #212529 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.061
- Midnight Purple #280137 ΔE 0.068
- Very Dark Purple #2A0134 ΔE 0.071
Use #181A3B 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.