#15317C
Closest named color: Marine Blue (#01386A). oklch(34.4% 0.132 264.7), rgb(21, 49, 124).
Aa
White text reads best on this color (11.91:1).
About this color
#15317C is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.132 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.040 away. White text reads best on it, at 11.91:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.91:1 |
Values
| HEX | #15317C |
| RGB | rgb(21, 49, 124) |
| HSL | hsl(224, 71%, 28%) |
| OKLCH | oklch(34.4% 0.132 264.7) |
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 #15317C | 11.91:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #15317C | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #15317C text on white | 11.91:1 | AAA | Lc 96.8 | Preferred for body text |
| #15317C text on black | 1.76:1 | 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
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#719DFF
oklch(70.8% 0.152 264.6)
-
Step 500
500
#4C80FF
oklch(63.2% 0.197 264.6)
-
Step 600
600
#3064F1
oklch(55.6% 0.219 264.7)
-
Step 700
700
#2451D2
oklch(49% 0.205 264.8)
-
Step 800
800
#1E44AA
oklch(42.8% 0.169 264.6)
-
Step 900
900 (this color)
#15317C
oklch(34.4% 0.132 264.7)
-
Step 950
950
#11234F
oklch(27% 0.084 264.6)
#15317C 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) | #003C7F | 0.030 |
| Deuteranopia (no green cones) | #00327B | 0.013 |
| Tritanopia (no blue cones) | #004451 | 0.103 |
| Achromatopsia (no color) | #373737 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15317C
#15317C
oklch(34.4% 0.132 264.7)
- #4A3500
#4A3500
oklch(34.4% 0.071 84)
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 #15317C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.040
- Twilight Blue #0A437A ΔE 0.051
- Marine #042E60 ΔE 0.052
- Midnight Blue #191970 ΔE 0.060
- Royal #0C1793 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.067
- Cobalt #1E488F ΔE 0.071
- Sapphire #2138AB ΔE 0.083
Use #15317C 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.