#18283F
Closest named color: Oxford Blue (#1B263B). oklch(27.5% 0.048 257.5), rgb(24, 40, 63).
Aa
White text reads best on this color (14.85:1).
About this color
#18283F is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.048 and its hue 257°. 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 14.85:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.41:1 |
| White text | 14.85:1 |
Values
| HEX | #18283F |
| RGB | rgb(24, 40, 63) |
| HSL | hsl(215, 45%, 17%) |
| OKLCH | oklch(27.5% 0.048 257.5) |
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 #18283F | 14.85:1 | AAA | Lc -104.5 | Preferred for body text |
| Black text on #18283F | 1.41:1 | Fails | Lc 0.0 | Not readable |
| #18283F text on white | 14.85:1 | AAA | Lc 101.6 | Preferred for body text |
| #18283F text on black | 1.41:1 | 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
#CCDAEE
oklch(88.4% 0.031 257.2)
-
Step 300
300
#AAC2E6
oklch(80.8% 0.057 258.4)
-
Step 400
400
#7CA2D9
oklch(70.6% 0.091 257.6)
-
Step 500
500
#5B8ACF
oklch(63% 0.117 257.9)
-
Step 600
600
#4073BC
oklch(55.5% 0.127 257.5)
-
Step 700
700
#3260A2
oklch(49% 0.118 257.6)
-
Step 800
800
#2A4F83
oklch(42.7% 0.097 257.2)
-
Step 900
900
#264269
oklch(37.7% 0.075 256.9)
-
Step 950
950 (this color)
#18283F
oklch(27.5% 0.048 257.5)
#18283F 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) | #1F2A40 | 0.013 |
| Deuteranopia (no green cones) | #1A263F | 0.007 |
| Tritanopia (no blue cones) | #032D30 | 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°).
- #18283F
#18283F
oklch(27.5% 0.048 257.5)
- #352408
#352408
oklch(27.5% 0.049 76.5)
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 #18283F, 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 0.026
- Space Cadet #2B2D42 ΔE 0.036
- Jet #212529 ΔE 0.041
- Gunmetal #293241 ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.056
- Rich Black #0D1B2A ΔE 0.059
- Marine #042E60 ΔE 0.060
Use #18283F 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.