#18233E
Closest named color: Oxford Blue (#1B263B). oklch(26.1% 0.053 266.1), rgb(24, 35, 62).
Aa
White text reads best on this color (15.56:1).
About this color
#18233E is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.053 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.014 away. White text reads best on it, at 15.56:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.34:1 |
| White text | 15.56:1 |
Values
| HEX | #18233E |
| RGB | rgb(24, 35, 62) |
| HSL | hsl(223, 44%, 17%) |
| OKLCH | oklch(26.1% 0.053 266.1) |
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 #18233E | 15.56:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #18233E | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #18233E text on white | 15.56:1 | AAA | Lc 102.4 | Preferred for body text |
| #18233E text on black | 1.34:1 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#839FE0
oklch(70.7% 0.101 266)
-
Step 500
500
#6586D7
oklch(63.1% 0.128 266.1)
-
Step 600
600
#4C6EC5
oklch(55.6% 0.141 265.9)
-
Step 700
700
#3E5BAA
oklch(49% 0.131 266.5)
-
Step 800
800
#334B8A
oklch(42.7% 0.108 266.2)
-
Step 900
900
#2C3F6E
oklch(37.6% 0.084 265.9)
-
Step 950
950 (this color)
#18233E
oklch(26.1% 0.053 266.1)
#18233E 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) | #18263F | 0.010 |
| Deuteranopia (no green cones) | #14223D | 0.007 |
| Tritanopia (no blue cones) | #05292D | 0.048 |
| Achromatopsia (no color) | #242424 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18233E
#18233E
oklch(26.1% 0.053 266.1)
- #302200
#302200
oklch(26.2% 0.054 85.7)
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 #18233E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.014
- Dark #1B2431 ΔE 0.026
- Jet #212529 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.048
- Rich Black #0D1B2A ΔE 0.048
- Gunmetal #293241 ΔE 0.059
- Marine #042E60 ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.069
Use #18233E 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.