#18213B
Closest named color: Oxford Blue (#1B263B). oklch(25.4% 0.051 268.2), rgb(24, 33, 59).
Aa
White text reads best on this color (15.91:1).
About this color
#18213B is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.051 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.018 away. White text reads best on it, at 15.91:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 15.91:1 |
Values
| HEX | #18213B |
| RGB | rgb(24, 33, 59) |
| HSL | hsl(225, 42%, 16%) |
| OKLCH | oklch(25.4% 0.051 268.2) |
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 #18213B | 15.91:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #18213B | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #18213B text on white | 15.91:1 | AAA | Lc 102.8 | Preferred for body text |
| #18213B text on black | 1.31:1 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B0C0E9
oklch(80.9% 0.061 268.3)
-
Step 400
400
#879EDD
oklch(70.6% 0.096 268.5)
-
Step 500
500
#6A85D4
oklch(63.1% 0.123 268.4)
-
Step 600
600
#526DC1
oklch(55.5% 0.134 268.4)
-
Step 700
700
#435BA7
oklch(49.1% 0.125 268.4)
-
Step 800
800
#374B87
oklch(42.8% 0.103 268)
-
Step 900
900
#2F3F6C
oklch(37.7% 0.08 267.7)
-
Step 950
950 (this color)
#18213B
oklch(25.4% 0.051 268.2)
#18213B 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) | #17243C | 0.010 |
| Deuteranopia (no green cones) | #13213A | 0.008 |
| Tritanopia (no blue cones) | #08272B | 0.046 |
| Achromatopsia (no color) | #222222 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18213B
#18213B
oklch(25.4% 0.051 268.2)
- #2D2101
#2D2101
oklch(25.5% 0.051 88)
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 #18213B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.018
- Dark #1B2431 ΔE 0.025
- Rich Black #0D1B2A ΔE 0.041
- Jet #212529 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.054
- Gunmetal #293241 ΔE 0.066
- Navy Blue #001146 ΔE 0.067
- Marine #042E60 ΔE 0.073
Use #18213B 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.