#18203C
Closest named color: Oxford Blue (#1B263B). oklch(25.2% 0.054 270.1), rgb(24, 32, 60).
Aa
White text reads best on this color (16.02:1).
About this color
#18203C is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.054 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.022 away. White text reads best on it, at 16.02:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 16.02:1 |
Values
| HEX | #18203C |
| RGB | rgb(24, 32, 60) |
| HSL | hsl(227, 43%, 16%) |
| OKLCH | oklch(25.2% 0.054 270.1) |
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 #18203C | 16.02:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #18203C | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #18203C text on white | 16.02:1 | AAA | Lc 102.9 | Preferred for body text |
| #18203C 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D9F2
oklch(88.6% 0.036 269.9)
-
Step 300
300
#B0BFEB
oklch(80.8% 0.065 270.2)
-
Step 400
400
#889DE1
oklch(70.7% 0.103 270.5)
-
Step 500
500
#6B84D9
oklch(63.2% 0.131 270)
-
Step 600
600
#546BC6
oklch(55.5% 0.143 270.5)
-
Step 700
700
#4459AB
oklch(49% 0.133 270.1)
-
Step 800
800
#38498B
oklch(42.6% 0.111 270.3)
-
Step 900
900
#303E6F
oklch(37.7% 0.086 269.9)
-
Step 950
950 (this color)
#18203C
oklch(25.2% 0.054 270.1)
#18203C 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) | #15233D | 0.010 |
| Deuteranopia (no green cones) | #11203B | 0.010 |
| Tritanopia (no blue cones) | #08262B | 0.048 |
| Achromatopsia (no color) | #212121 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18203C
#18203C
oklch(25.2% 0.054 270.1)
- #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 #18203C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.022
- Dark #1B2431 ΔE 0.028
- Rich Black #0D1B2A ΔE 0.041
- Jet #212529 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.056
- Navy Blue #001146 ΔE 0.064
- Gunmetal #293241 ΔE 0.069
- Dark Indigo #1F0954 ΔE 0.072
Use #18203C 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.