#15375E
Closest named color: Prussian Blue (#1D3557). oklch(33.4% 0.08 253.9), rgb(21, 55, 94).
Aa
White text reads best on this color (12.06:1).
About this color
#15375E is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.080 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.014 away. White text reads best on it, at 12.06:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.73:1 |
| White text | 12.06:1 |
Values
| HEX | #15375E |
| RGB | rgb(21, 55, 94) |
| HSL | hsl(212, 63%, 23%) |
| OKLCH | oklch(33.4% 0.08 253.9) |
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 #15375E | 12.06:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #15375E | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #15375E text on white | 12.06:1 | AAA | Lc 97.3 | Preferred for body text |
| #15375E text on black | 1.73:1 | 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
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A6C3E7
oklch(80.8% 0.06 254)
-
Step 400
400
#76A4DB
oklch(70.7% 0.095 253.4)
-
Step 500
500
#528CD1
oklch(63.1% 0.121 253.8)
-
Step 600
600
#3475BE
oklch(55.6% 0.132 253.5)
-
Step 700
700
#2662A4
oklch(49.2% 0.122 253.4)
-
Step 800
800
#215085
oklch(42.7% 0.102 253.6)
-
Step 900
900 (this color)
#15375E
oklch(33.4% 0.08 253.9)
-
Step 950
950
#14273E
oklch(26.9% 0.05 254.1)
#15375E 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) | #253A60 | 0.021 |
| Deuteranopia (no green cones) | #1A335D | 0.012 |
| Tritanopia (no blue cones) | #004046 | 0.060 |
| Achromatopsia (no color) | #363636 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15375E
#15375E
oklch(33.4% 0.08 253.9)
- #4C3000
#4C3000
oklch(33.5% 0.071 74)
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 #15375E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.014
- Marine Blue #01386A ΔE 0.023
- Marine #042E60 ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.037
- Midnight Green #073B4C ΔE 0.039
- Gunmetal #293241 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.056
Use #15375E 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.