#15375A
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.074 251.6), rgb(21, 55, 90).
Aa
White text reads best on this color (12.16:1).
About this color
#15375A is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.074 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.010 away. White text reads best on it, at 12.16:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.72:1 |
| White text | 12.16:1 |
Values
| HEX | #15375A |
| RGB | rgb(21, 55, 90) |
| HSL | hsl(210, 62%, 22%) |
| OKLCH | oklch(33.1% 0.074 251.6) |
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 #15375A | 12.16:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #15375A | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #15375A text on white | 12.16:1 | AAA | Lc 97.5 | Preferred for body text |
| #15375A text on black | 1.72:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A7C4E4
oklch(81% 0.055 251.1)
-
Step 400
400
#77A4D6
oklch(70.6% 0.088 251.7)
-
Step 500
500
#538DCC
oklch(63.1% 0.113 251.8)
-
Step 600
600
#3676B8
oklch(55.6% 0.122 251.5)
-
Step 700
700
#28639F
oklch(49.1% 0.114 251.6)
-
Step 800
800
#225181
oklch(42.7% 0.095 251.4)
-
Step 900
900 (this color)
#15375A
oklch(33.1% 0.074 251.6)
-
Step 950
950
#14283C
oklch(27.1% 0.046 249.9)
#15375A 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) | #27395B | 0.022 |
| Deuteranopia (no green cones) | #1D3359 | 0.014 |
| Tritanopia (no blue cones) | #003F44 | 0.055 |
| Achromatopsia (no color) | #363636 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15375A
#15375A
oklch(33.1% 0.074 251.6)
- #4C2E00
#4C2E00
oklch(33% 0.071 70.9)
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 #15375A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.010
- Marine Blue #01386A ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.031
- Midnight Green #073B4C ΔE 0.033
- Marine #042E60 ΔE 0.036
- Gunmetal #293241 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.056
Use #15375A 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.