#15307A
Closest named color: Marine Blue (#01386A). oklch(34% 0.13 264.9), rgb(21, 48, 122).
Aa
White text reads best on this color (12.09:1).
About this color
#15307A is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.130 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.038 away. White text reads best on it, at 12.09:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.73:1 |
| White text | 12.09:1 |
Values
| HEX | #15307A |
| RGB | rgb(21, 48, 122) |
| HSL | hsl(224, 71%, 28%) |
| OKLCH | oklch(34% 0.13 264.9) |
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 #15307A | 12.09:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #15307A | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #15307A text on white | 12.09:1 | AAA | Lc 97.1 | Preferred for body text |
| #15307A text on black | 1.73:1 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FE
oklch(88.5% 0.054 265.8)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#3264F0
oklch(55.6% 0.218 265)
-
Step 700
700
#2552D1
oklch(49.2% 0.202 264.8)
-
Step 800
800
#2044A9
oklch(42.8% 0.168 265)
-
Step 900
900 (this color)
#15307A
oklch(34% 0.13 264.9)
-
Step 950
950
#12234E
oklch(26.9% 0.082 265.1)
#15307A 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) | #003B7C | 0.030 |
| Deuteranopia (no green cones) | #003179 | 0.014 |
| Tritanopia (no blue cones) | #004350 | 0.102 |
| Achromatopsia (no color) | #363636 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15307A
#15307A
oklch(34% 0.13 264.9)
- #483400
#483400
oklch(33.9% 0.069 84.8)
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 #15307A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.038
- Marine #042E60 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.053
- Midnight Blue #191970 ΔE 0.057
- Royal #0C1793 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.065
- Cobalt #1E488F ΔE 0.075
- Dark Blue #00008B ΔE 0.086
Use #15307A 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.