#18213D
Closest named color: Oxford Blue (#1B263B). oklch(25.5% 0.055 268.9), rgb(24, 33, 61).
Aa
White text reads best on this color (15.86:1).
About this color
#18213D is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.055 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.019 away. White text reads best on it, at 15.86:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.86:1 |
Values
| HEX | #18213D |
| RGB | rgb(24, 33, 61) |
| HSL | hsl(225, 44%, 17%) |
| OKLCH | oklch(25.5% 0.055 268.9) |
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 #18213D | 15.86:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #18213D | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #18213D text on white | 15.86:1 | AAA | Lc 102.7 | Preferred for body text |
| #18213D text on black | 1.32:1 | 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
#CFD9F2
oklch(88.5% 0.036 268.3)
-
Step 300
300
#AFC0EB
oklch(80.9% 0.064 268.1)
-
Step 400
400
#869EE2
oklch(70.8% 0.104 268.8)
-
Step 500
500
#6984D9
oklch(63.1% 0.132 269.1)
-
Step 600
600
#516CC7
oklch(55.6% 0.144 268.9)
-
Step 700
700
#425AAC
oklch(49.2% 0.134 268.8)
-
Step 800
800
#364A8B
oklch(42.7% 0.11 268.6)
-
Step 900
900
#2F3E6F
oklch(37.7% 0.086 269.2)
-
Step 950
950 (this color)
#18213D
oklch(25.5% 0.055 268.9)
#18213D 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) | #16243E | 0.010 |
| Deuteranopia (no green cones) | #11213C | 0.010 |
| Tritanopia (no blue cones) | #06272C | 0.048 |
| Achromatopsia (no color) | #222222 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18213D
#18213D
oklch(25.5% 0.055 268.9)
- #2D2100
#2D2100
oklch(25.5% 0.052 88.6)
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 #18213D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.019
- Dark #1B2431 ΔE 0.028
- Rich Black #0D1B2A ΔE 0.044
- Jet #212529 ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.053
- Gunmetal #293241 ΔE 0.065
- Navy Blue #001146 ΔE 0.066
- Marine #042E60 ΔE 0.070
Use #18213D 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.