#18273E
Closest named color: Oxford Blue (#1B263B). oklch(27.2% 0.048 258.7), rgb(24, 39, 62).
Aa
White text reads best on this color (15.01:1).
About this color
#18273E is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.048 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.007 away. White text reads best on it, at 15.01:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.39:1 |
| White text | 15.01:1 |
Values
| HEX | #18273E |
| RGB | rgb(24, 39, 62) |
| HSL | hsl(216, 44%, 17%) |
| OKLCH | oklch(27.2% 0.048 258.7) |
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 #18273E | 15.01:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #18273E | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #18273E text on white | 15.01:1 | AAA | Lc 101.8 | Preferred for body text |
| #18273E text on black | 1.39:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E6
oklch(80.9% 0.057 259.3)
-
Step 400
400
#7EA2D9
oklch(70.7% 0.09 258.7)
-
Step 500
500
#5D8ACF
oklch(63.1% 0.116 258.7)
-
Step 600
600
#4373BC
oklch(55.7% 0.126 258.6)
-
Step 700
700
#3560A2
oklch(49.2% 0.117 258.7)
-
Step 800
800
#2C4E83
oklch(42.6% 0.097 259)
-
Step 900
900
#284269
oklch(37.8% 0.074 258.3)
-
Step 950
950 (this color)
#18273E
oklch(27.2% 0.048 258.7)
#18273E 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) | #1E293F | 0.012 |
| Deuteranopia (no green cones) | #19253E | 0.007 |
| Tritanopia (no blue cones) | #042C2F | 0.043 |
| Achromatopsia (no color) | #272727 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18273E
#18273E
oklch(27.2% 0.048 258.7)
- #332408
#332408
oklch(27.2% 0.047 79.9)
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 #18273E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.007
- Dark #1B2431 ΔE 0.024
- Space Cadet #2B2D42 ΔE 0.038
- Jet #212529 ΔE 0.040
- Gunmetal #293241 ΔE 0.047
- Rich Black #0D1B2A ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.060
- Marine #042E60 ΔE 0.063
Use #18273E 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.