#28366E
Closest named color: Marine Blue (#01386A). oklch(35.3% 0.098 270.2), rgb(40, 54, 110).
Aa
White text reads best on this color (11.39:1).
About this color
#28366E is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.098 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.034 away. White text reads best on it, at 11.39:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.39:1 |
Values
| HEX | #28366E |
| RGB | rgb(40, 54, 110) |
| HSL | hsl(228, 47%, 29%) |
| OKLCH | oklch(35.3% 0.098 270.2) |
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 #28366E | 11.39:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #28366E | 1.84:1 | Fails | Lc 7.8 | Not readable |
| #28366E text on white | 11.39:1 | AAA | Lc 96.1 | Preferred for body text |
| #28366E 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED8F5
oklch(88.4% 0.041 270.4)
-
Step 300
300
#AEBFF1
oklch(80.9% 0.073 270.1)
-
Step 400
400
#849CEA
oklch(70.6% 0.118 270.2)
-
Step 500
500
#6782E4
oklch(63.2% 0.15 270.1)
-
Step 600
600
#5069D2
oklch(55.7% 0.164 270.2)
-
Step 700
700
#4157B6
oklch(49.2% 0.152 270.1)
-
Step 800
800
#354793
oklch(42.6% 0.127 270.2)
-
Step 900
900 (this color)
#28366E
oklch(35.3% 0.098 270.2)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#28366E 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) | #1A3D70 | 0.023 |
| Deuteranopia (no green cones) | #0D376D | 0.027 |
| Tritanopia (no blue cones) | #00434C | 0.086 |
| Achromatopsia (no color) | #3A3A3A | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28366E
#28366E
oklch(35.3% 0.098 270.2)
- #4A3900
#4A3900
oklch(35.3% 0.072 89.9)
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 #28366E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.034
- Twilight Blue #0A437A ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.044
- Marine #042E60 ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.066
- Cobalt #1E488F ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.074
Use #28366E 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.