#15337F
Closest named color: Marine Blue (#01386A). oklch(35.1% 0.134 264.2), rgb(21, 51, 127).
Aa
White text reads best on this color (11.59:1).
About this color
#15337F is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.134 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.042 away. White text reads best on it, at 11.59:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #15337F |
| RGB | rgb(21, 51, 127) |
| HSL | hsl(223, 72%, 29%) |
| OKLCH | oklch(35.1% 0.134 264.2) |
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 #15337F | 11.59:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #15337F | 1.81:1 | Fails | Lc 7.8 | Not readable |
| #15337F text on white | 11.59:1 | AAA | Lc 96.1 | Preferred for body text |
| #15337F text on black | 1.81:1 | 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
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#2C64F3
oklch(55.7% 0.223 264.1)
-
Step 700
700
#2051D4
oklch(49.1% 0.208 264.2)
-
Step 800
800
#1C44AB
oklch(42.8% 0.171 264.2)
-
Step 900
900 (this color)
#15337F
oklch(35.1% 0.134 264.2)
-
Step 950
950
#10234F
oklch(26.9% 0.085 264)
#15337F 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) | #003E82 | 0.030 |
| Deuteranopia (no green cones) | #00347E | 0.013 |
| Tritanopia (no blue cones) | #004653 | 0.104 |
| Achromatopsia (no color) | #393939 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15337F
#15337F
oklch(35.1% 0.134 264.2)
- #4C3700
#4C3700
oklch(35.1% 0.072 84.7)
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 #15337F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.042
- Twilight Blue #0A437A ΔE 0.046
- Marine #042E60 ΔE 0.058
- Cobalt #1E488F ΔE 0.064
- Royal #0C1793 ΔE 0.065
- Midnight Blue #191970 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.071
- Sapphire #2138AB ΔE 0.076
Use #15337F 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.