#18203E
Closest named color: Oxford Blue (#1B263B). oklch(25.3% 0.058 270.6), rgb(24, 32, 62).
Aa
White text reads best on this color (15.96:1).
About this color
#18203E is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.058 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.023 away. White text reads best on it, at 15.96:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 15.96:1 |
Values
| HEX | #18203E |
| RGB | rgb(24, 32, 62) |
| HSL | hsl(227, 44%, 17%) |
| OKLCH | oklch(25.3% 0.058 270.6) |
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 #18203E | 15.96:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #18203E | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #18203E text on white | 15.96:1 | AAA | Lc 102.8 | Preferred for body text |
| #18203E text on black | 1.31:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5EAF8
oklch(93.7% 0.02 270.2)
-
Step 200
200
#CFD8F3
oklch(88.4% 0.038 271)
-
Step 300
300
#B0BFEE
oklch(80.9% 0.069 271)
-
Step 400
400
#879DE5
oklch(70.8% 0.109 270.5)
-
Step 500
500
#6A83DE
oklch(63.2% 0.14 270.4)
-
Step 600
600
#536ACB
oklch(55.6% 0.152 270.7)
-
Step 700
700
#4358B0
oklch(49.1% 0.142 270.3)
-
Step 800
800
#37488E
oklch(42.6% 0.117 270.5)
-
Step 900
900
#303D72
oklch(37.7% 0.092 271.1)
-
Step 950
950 (this color)
#18203E
oklch(25.3% 0.058 270.6)
#18203E 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) | #13233F | 0.011 |
| Deuteranopia (no green cones) | #0F203D | 0.013 |
| Tritanopia (no blue cones) | #06272B | 0.053 |
| Achromatopsia (no color) | #222222 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18203E
#18203E
oklch(25.3% 0.058 270.6)
- #2C2100
#2C2100
oklch(25.4% 0.052 90.4)
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 #18203E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.023
- Dark #1B2431 ΔE 0.032
- Rich Black #0D1B2A ΔE 0.045
- Jet #212529 ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.056
- Navy Blue #001146 ΔE 0.063
- Gunmetal #293241 ΔE 0.069
- Dark Indigo #1F0954 ΔE 0.069
Use #18203E 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.