#15355D
Closest named color: Prussian Blue (#1D3557). oklch(32.8% 0.08 255.4), rgb(21, 53, 93).
Aa
White text reads best on this color (12.35:1).
About this color
#15355D is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.080 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.013 away. White text reads best on it, at 12.35:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.69:1 |
| White text | 12.35:1 |
Values
| HEX | #15355D |
| RGB | rgb(21, 53, 93) |
| HSL | hsl(213, 63%, 22%) |
| OKLCH | oklch(32.8% 0.08 255.4) |
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 #15355D | 12.35:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #15355D | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #15355D text on white | 12.35:1 | AAA | Lc 97.9 | Preferred for body text |
| #15355D 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#78A3DC
oklch(70.7% 0.096 255.7)
-
Step 500
500
#548BD3
oklch(63.1% 0.124 255.8)
-
Step 600
600
#3774C0
oklch(55.6% 0.134 255.3)
-
Step 700
700
#2961A6
oklch(49.2% 0.125 255.3)
-
Step 800
800
#244F86
oklch(42.6% 0.103 255.8)
-
Step 900
900 (this color)
#15355D
oklch(32.8% 0.08 255.4)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#15355D 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) | #22385F | 0.018 |
| Deuteranopia (no green cones) | #17315C | 0.012 |
| Tritanopia (no blue cones) | #003E44 | 0.062 |
| Achromatopsia (no color) | #343434 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15355D
#15355D
oklch(32.8% 0.08 255.4)
- #492F00
#492F00
oklch(32.8% 0.069 75.7)
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 #15355D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.013
- Marine Blue #01386A ΔE 0.025
- Marine #042E60 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.040
- Midnight Green #073B4C ΔE 0.041
- Gunmetal #293241 ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.060
Use #15355D 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.