#181A40
Closest named color: Oxford Blue (#1B263B). oklch(24% 0.071 277.4), rgb(24, 26, 64).
Aa
White text reads best on this color (16.65:1).
About this color
#181A40 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.071 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.043 away. White text reads best on it, at 16.65:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.65:1 |
Values
| HEX | #181A40 |
| RGB | rgb(24, 26, 64) |
| HSL | hsl(237, 45%, 17%) |
| OKLCH | oklch(24% 0.071 277.4) |
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 #181A40 | 16.65:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #181A40 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #181A40 text on white | 16.65:1 | AAA | Lc 103.5 | Preferred for body text |
| #181A40 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B3BCF7
oklch(80.9% 0.084 277.6)
-
Step 400
400
#8D97F3
oklch(70.7% 0.134 277.7)
-
Step 500
500
#727AEF
oklch(63% 0.173 277.3)
-
Step 600
600
#5D60DD
oklch(55.6% 0.187 277.4)
-
Step 700
700
#4D4EC0
oklch(49% 0.174 277.4)
-
Step 800
800
#3F419B
oklch(42.7% 0.143 277.5)
-
Step 900
900
#35387B
oklch(37.6% 0.112 277.7)
-
Step 950
950 (this color)
#181A40
oklch(24% 0.071 277.4)
#181A40 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) | #062041 | 0.027 |
| Deuteranopia (no green cones) | #021C3F | 0.028 |
| Tritanopia (no blue cones) | #05232A | 0.062 |
| Achromatopsia (no color) | #1E1E1E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181A40
#181A40
oklch(24% 0.071 277.4)
- #261F00
#261F00
oklch(24% 0.05 96.9)
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 #181A40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.043
- Rich Black #0D1B2A ΔE 0.048
- Navy Blue #001146 ΔE 0.048
- Dark #1B2431 ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.053
- Jet #212529 ΔE 0.067
- Midnight Purple #280137 ΔE 0.069
- Night Blue #040348 ΔE 0.071
Use #181A40 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.