#15316D
Closest named color: Marine Blue (#01386A). oklch(33% 0.11 263), rgb(21, 49, 109).
Aa
White text reads best on this color (12.41:1).
About this color
#15316D is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.110 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.023 away. White text reads best on it, at 12.41:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.69:1 |
| White text | 12.41:1 |
Values
| HEX | #15316D |
| RGB | rgb(21, 49, 109) |
| HSL | hsl(221, 68%, 25%) |
| OKLCH | oklch(33% 0.11 263) |
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 #15316D | 12.41:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #15316D | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #15316D text on white | 12.41:1 | AAA | Lc 97.8 | Preferred for body text |
| #15316D text on black | 1.69:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A5C1F7
oklch(80.9% 0.083 263.3)
-
Step 400
400
#749FF3
oklch(70.7% 0.132 262.8)
-
Step 500
500
#5184EE
oklch(63.1% 0.169 263.1)
-
Step 600
600
#366BDD
oklch(55.6% 0.184 263)
-
Step 700
700
#2958C0
oklch(49.1% 0.172 263.2)
-
Step 800
800
#23499B
oklch(42.7% 0.141 263.1)
-
Step 900
900 (this color)
#15316D
oklch(33% 0.11 263)
-
Step 950
950
#142548
oklch(27.1% 0.069 263.1)
#15316D 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) | #07386F | 0.020 |
| Deuteranopia (no green cones) | #00306C | 0.016 |
| Tritanopia (no blue cones) | #00404A | 0.087 |
| Achromatopsia (no color) | #343434 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15316D
#15316D
oklch(33% 0.11 263)
- #463200
#463200
oklch(33.1% 0.068 84.1)
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 #15316D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.023
- Marine #042E60 ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.054
- Midnight Blue #191970 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.071
- Midnight Green #073B4C ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.079
Use #15316D 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.