#15315B
Closest named color: Prussian Blue (#1D3557). oklch(31.6% 0.083 258.5), rgb(21, 49, 91).
Aa
White text reads best on this color (12.94:1).
About this color
#15315B is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.083 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 12.94:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.62:1 |
| White text | 12.94:1 |
Values
| HEX | #15315B |
| RGB | rgb(21, 49, 91) |
| HSL | hsl(216, 63%, 22%) |
| OKLCH | oklch(31.6% 0.083 258.5) |
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 #15315B | 12.94:1 | AAA | Lc -102.2 | Preferred for body text |
| Black text on #15315B | 1.62:1 | Fails | Lc 0.0 | Not readable |
| #15315B text on white | 12.94:1 | AAA | Lc 98.9 | Preferred for body text |
| #15315B text on black | 1.62:1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFE
oklch(88.6% 0.054 258.7)
-
Step 300
300
#9AC2FF
oklch(80.8% 0.097 258.7)
-
Step 400
400
#62A0FF
oklch(70.7% 0.154 258.7)
-
Step 500
500
#3084FF
oklch(63% 0.2 258.6)
-
Step 600
600
#006BEB
oklch(55.7% 0.21 258.5)
-
Step 700
700
#0059C7
oklch(49% 0.186 258.6)
-
Step 800
800
#0049A5
oklch(42.7% 0.162 258.5)
-
Step 900
900
#0A3E85
oklch(37.8% 0.13 258.3)
-
Step 950
950 (this color)
#15315B
oklch(31.6% 0.083 258.5)
#15315B 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) | #1D355D | 0.017 |
| Deuteranopia (no green cones) | #102E5A | 0.011 |
| Tritanopia (no blue cones) | #003B41 | 0.066 |
| Achromatopsia (no color) | #313131 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15315B
#15315B
oklch(31.6% 0.083 258.5)
- #442D00
#442D00
oklch(31.7% 0.066 78.2)
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 #15315B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Marine #042E60 ΔE 0.020
- Marine Blue #01386A ΔE 0.032
- Midnight Green #073B4C ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.050
- Gunmetal #293241 ΔE 0.053
- Oxford Blue #1B263B ΔE 0.062
Use #15315B 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.