#15233C
Closest named color: Oxford Blue (#1B263B). oklch(25.7% 0.051 261.3), rgb(21, 35, 60).
Aa
White text reads best on this color (15.70:1).
About this color
#15233C is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.051 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.015 away. White text reads best on it, at 15.70:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.33:1 |
| White text | 15.70:1 |
Values
| HEX | #15233C |
| RGB | rgb(21, 35, 60) |
| HSL | hsl(218, 48%, 16%) |
| OKLCH | oklch(25.7% 0.051 261.3) |
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 #15233C | 15.70:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #15233C | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #15233C text on white | 15.70:1 | AAA | Lc 102.6 | Preferred for body text |
| #15233C text on black | 1.33:1 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ABC2E9
oklch(81% 0.061 261)
-
Step 400
400
#7EA1DD
oklch(70.7% 0.097 260.9)
-
Step 500
500
#5E88D4
oklch(63% 0.124 261.5)
-
Step 600
600
#4471C1
oklch(55.6% 0.134 261)
-
Step 700
700
#365EA7
oklch(49.1% 0.126 261.4)
-
Step 800
800
#2D4D87
oklch(42.6% 0.104 261.3)
-
Step 900
900
#28416C
oklch(37.7% 0.08 260.6)
-
Step 950
950 (this color)
#15233C
oklch(25.7% 0.051 261.3)
#15233C 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) | #19253D | 0.009 |
| Deuteranopia (no green cones) | #14213B | 0.007 |
| Tritanopia (no blue cones) | #00292C | 0.047 |
| Achromatopsia (no color) | #232323 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15233C
#15233C
oklch(25.7% 0.051 261.3)
- #302001
#302001
oklch(25.7% 0.052 80.6)
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 #15233C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.015
- Dark #1B2431 ΔE 0.024
- Jet #212529 ΔE 0.042
- Rich Black #0D1B2A ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.051
- Gunmetal #293241 ΔE 0.062
- Marine #042E60 ΔE 0.069
- Navy Blue #001146 ΔE 0.069
Use #15233C 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.