#18243E
Closest named color: Oxford Blue (#1B263B). oklch(26.4% 0.052 264.4), rgb(24, 36, 62).
Aa
White text reads best on this color (15.43:1).
About this color
#18243E is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.052 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.011 away. White text reads best on it, at 15.43:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.36:1 |
| White text | 15.43:1 |
Values
| HEX | #18243E |
| RGB | rgb(24, 36, 62) |
| HSL | hsl(221, 44%, 17%) |
| OKLCH | oklch(26.4% 0.052 264.4) |
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 #18243E | 15.43:1 | AAA | Lc -105.0 | Preferred for body text |
| Black text on #18243E | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #18243E text on white | 15.43:1 | AAA | Lc 102.3 | Preferred for body text |
| #18243E text on black | 1.36:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F0
oklch(88.4% 0.034 265.2)
-
Step 300
300
#ADC1E9
oklch(80.9% 0.061 264.2)
-
Step 400
400
#82A0DE
oklch(70.7% 0.097 264.2)
-
Step 500
500
#6387D5
oklch(63.1% 0.125 264.4)
-
Step 600
600
#4A6FC2
oklch(55.5% 0.136 264.3)
-
Step 700
700
#3B5DA8
oklch(49.2% 0.126 264)
-
Step 800
800
#314C88
oklch(42.7% 0.105 264.2)
-
Step 900
900
#2B406D
oklch(37.7% 0.082 264)
-
Step 950
950 (this color)
#18243E
oklch(26.4% 0.052 264.4)
#18243E 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) | #1A263F | 0.008 |
| Deuteranopia (no green cones) | #15233D | 0.006 |
| Tritanopia (no blue cones) | #052A2E | 0.046 |
| Achromatopsia (no color) | #242424 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18243E
#18243E
oklch(26.4% 0.052 264.4)
- #312202
#312202
oklch(26.3% 0.052 82.7)
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 #18243E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.011
- Dark #1B2431 ΔE 0.025
- Jet #212529 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.045
- Rich Black #0D1B2A ΔE 0.050
- Gunmetal #293241 ΔE 0.056
- Marine #042E60 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.066
Use #18243E 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.