#15357F
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.131 263.5), rgb(21, 53, 127).
Aa
White text reads best on this color (11.36:1).
About this color
#15357F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.131 and its hue 263°. 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 11.36:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.36:1 |
Values
| HEX | #15357F |
| RGB | rgb(21, 53, 127) |
| HSL | hsl(222, 72%, 29%) |
| OKLCH | oklch(35.5% 0.131 263.5) |
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 #15357F | 11.36:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #15357F | 1.84:1 | Fails | Lc 8.2 | Not readable |
| #15357F text on white | 11.36:1 | AAA | Lc 95.7 | Preferred for body text |
| #15357F text on black | 1.84:1 | 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
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4881FF
oklch(63.2% 0.197 263.5)
-
Step 600
600
#2A65F0
oklch(55.5% 0.218 263.5)
-
Step 700
700
#1E53D1
oklch(49.1% 0.202 263.4)
-
Step 800
800
#1A45A9
oklch(42.8% 0.168 263.4)
-
Step 900
900 (this color)
#15357F
oklch(35.5% 0.131 263.5)
-
Step 950
950
#10244E
oklch(27.1% 0.082 263)
#15357F 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) | #003F82 | 0.027 |
| Deuteranopia (no green cones) | #00357E | 0.013 |
| Tritanopia (no blue cones) | #004754 | 0.101 |
| Achromatopsia (no color) | #3A3A3A | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15357F
#15357F
oklch(35.5% 0.131 263.5)
- #4E3800
#4E3800
oklch(35.6% 0.073 83.9)
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 #15357F, 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 0.041
- Cobalt #1E488F ΔE 0.060
- Marine #042E60 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.070
- Royal #0C1793 ΔE 0.070
- Midnight Blue #191970 ΔE 0.072
- Sapphire #2138AB ΔE 0.075
Use #15357F 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.