#18204E
Closest named color: Oxford Blue (#1B263B). oklch(26.6% 0.085 272), rgb(24, 32, 78).
Aa
White text reads best on this color (15.49:1).
About this color
#18204E is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.085 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.044 away. White text reads best on it, at 15.49:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.35:1 |
| White text | 15.49:1 |
Values
| HEX | #18204E |
| RGB | rgb(24, 32, 78) |
| HSL | hsl(231, 53%, 20%) |
| OKLCH | oklch(26.6% 0.085 272) |
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 #18204E | 15.49:1 | AAA | Lc -104.9 | Preferred for body text |
| Black text on #18204E | 1.35:1 | Fails | Lc 0.0 | Not readable |
| #18204E text on white | 15.49:1 | AAA | Lc 102.2 | Preferred for body text |
| #18204E 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#627AFF
oklch(63.1% 0.198 271.8)
-
Step 600
600
#4C5CF3
oklch(55.6% 0.224 272.1)
-
Step 700
700
#3E4BD3
oklch(49.2% 0.206 272)
-
Step 800
800
#323EAB
oklch(42.6% 0.173 271.9)
-
Step 900
900
#2B3787
oklch(37.7% 0.134 271.9)
-
Step 950
950 (this color)
#18204E
oklch(26.6% 0.085 272)
#18204E 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) | #032750 | 0.027 |
| Deuteranopia (no green cones) | #00224D | 0.025 |
| Tritanopia (no blue cones) | #002B33 | 0.072 |
| Achromatopsia (no color) | #242424 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18204E
#18204E
oklch(26.6% 0.085 272)
- #2F2400
#2F2400
oklch(26.6% 0.054 91.5)
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 #18204E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.044
- Marine #042E60 ΔE 0.050
- Dark Indigo #1F0954 ΔE 0.052
- Dark #1B2431 ΔE 0.059
- Navy Blue #001146 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.061
- Midnight Blue #191970 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.067
Use #18204E 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.