#15243A
Closest named color: Oxford Blue (#1B263B). oklch(25.9% 0.047 257.9), rgb(21, 36, 58).
Aa
White text reads best on this color (15.60:1).
About this color
#15243A is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.047 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.012 away. White text reads best on it, at 15.60:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.34:1 |
| White text | 15.60:1 |
Values
| HEX | #15243A |
| RGB | rgb(21, 36, 58) |
| HSL | hsl(216, 47%, 15%) |
| OKLCH | oklch(25.9% 0.047 257.9) |
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 #15243A | 15.60:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #15243A | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #15243A text on white | 15.60:1 | AAA | Lc 102.5 | Preferred for body text |
| #15243A text on black | 1.34:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E5
oklch(80.9% 0.056 258.7)
-
Step 400
400
#7EA2D8
oklch(70.6% 0.089 258.3)
-
Step 500
500
#5D8ACD
oklch(63% 0.113 258.1)
-
Step 600
600
#4373BA
oklch(55.6% 0.123 258.1)
-
Step 700
700
#3560A0
oklch(49% 0.114 258.2)
-
Step 800
800
#2C4F82
oklch(42.7% 0.094 257.8)
-
Step 900
900
#284268
oklch(37.7% 0.073 257.8)
-
Step 950
950 (this color)
#15243A
oklch(25.9% 0.047 257.9)
#15243A 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) | #1B253B | 0.010 |
| Deuteranopia (no green cones) | #16223A | 0.007 |
| Tritanopia (no blue cones) | #02292C | 0.041 |
| Achromatopsia (no color) | #242424 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15243A
#15243A
oklch(25.9% 0.047 257.9)
- #302106
#302106
oklch(26% 0.046 78.9)
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 #15243A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.012
- Dark #1B2431 ΔE 0.019
- Jet #212529 ΔE 0.037
- Rich Black #0D1B2A ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.050
- Gunmetal #293241 ΔE 0.059
- Marine #042E60 ΔE 0.071
- Prussian Blue #1D3557 ΔE 0.072
Use #15243A 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.