#18243B
Closest named color: Oxford Blue (#1B263B). oklch(26.2% 0.047 262.6), rgb(24, 36, 59).
Aa
White text reads best on this color (15.50:1).
About this color
#18243B is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.047 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.009 away. White text reads best on it, at 15.50:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.35:1 |
| White text | 15.50:1 |
Values
| HEX | #18243B |
| RGB | rgb(24, 36, 59) |
| HSL | hsl(219, 42%, 16%) |
| OKLCH | oklch(26.2% 0.047 262.6) |
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 #18243B | 15.50:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #18243B | 1.35:1 | Fails | Lc 0.0 | Not readable |
| #18243B text on white | 15.50:1 | AAA | Lc 102.4 | Preferred for body text |
| #18243B text on black | 1.35:1 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#AEC1E5
oklch(80.9% 0.055 263.2)
-
Step 400
400
#83A1D8
oklch(70.7% 0.088 262.2)
-
Step 500
500
#6488CE
oklch(63% 0.114 262.8)
-
Step 600
600
#4B71BB
oklch(55.6% 0.123 262.5)
-
Step 700
700
#3D5EA1
oklch(49% 0.114 263.1)
-
Step 800
800
#324D82
oklch(42.6% 0.094 262.7)
-
Step 900
900
#2C4169
oklch(37.8% 0.074 262.4)
-
Step 950
950 (this color)
#18243B
oklch(26.2% 0.047 262.6)
#18243B 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) | #1B263C | 0.009 |
| Deuteranopia (no green cones) | #17233B | 0.004 |
| Tritanopia (no blue cones) | #08292C | 0.042 |
| Achromatopsia (no color) | #242424 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18243B
#18243B
oklch(26.2% 0.047 262.6)
- #2F2206
#2F2206
oklch(26.1% 0.046 83.4)
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 #18243B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.009
- Dark #1B2431 ΔE 0.019
- Jet #212529 ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.046
- Gunmetal #293241 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.070
- Marine #042E60 ΔE 0.070
Use #18243B 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.