#28366B
Closest named color: Marine Blue (#01386A). oklch(35.1% 0.094 269.9), rgb(40, 54, 107).
Aa
White text reads best on this color (11.47:1).
About this color
#28366B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.094 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.033 away. White text reads best on it, at 11.47:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.83:1 |
| White text | 11.47:1 |
Values
| HEX | #28366B |
| RGB | rgb(40, 54, 107) |
| HSL | hsl(227, 46%, 29%) |
| OKLCH | oklch(35.1% 0.094 269.9) |
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 #28366B | 11.47:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #28366B | 1.83:1 | Fails | Lc 7.7 | Not readable |
| #28366B text on white | 11.47:1 | AAA | Lc 96.2 | Preferred for body text |
| #28366B text on black | 1.83:1 | 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
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CFD9F4
oklch(88.6% 0.039 269.4)
-
Step 300
300
#AFBFEF
oklch(80.9% 0.07 270.4)
-
Step 400
400
#859DE7
oklch(70.7% 0.112 269.7)
-
Step 500
500
#6883E0
oklch(63.2% 0.143 269.8)
-
Step 600
600
#516ACE
oklch(55.7% 0.157 270.1)
-
Step 700
700
#4258B2
oklch(49.2% 0.145 270)
-
Step 800
800
#364890
oklch(42.7% 0.12 270.1)
-
Step 900
900 (this color)
#28366B
oklch(35.1% 0.094 269.9)
-
Step 950
950
#1B2443
oklch(26.9% 0.059 269.9)
#28366B 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) | #1C3D6D | 0.023 |
| Deuteranopia (no green cones) | #12376A | 0.023 |
| Tritanopia (no blue cones) | #00424B | 0.082 |
| Achromatopsia (no color) | #393939 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28366B
#28366B
oklch(35.1% 0.094 269.9)
- #493800
#493800
oklch(35% 0.071 89.7)
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 #28366B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.045
- Marine #042E60 ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.063
- Midnight Green #073B4C ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.073
Use #28366B 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.