#28307C
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.128 273.3), rgb(40, 48, 124).
Aa
White text reads best on this color (11.64:1).
About this color
#28307C is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.128 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.051 away. White text reads best on it, at 11.64:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.64:1 |
Values
| HEX | #28307C |
| RGB | rgb(40, 48, 124) |
| HSL | hsl(234, 51%, 32%) |
| OKLCH | oklch(35.2% 0.128 273.3) |
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 #28307C | 11.64:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #28307C | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #28307C text on white | 11.64:1 | AAA | Lc 96.4 | Preferred for body text |
| #28307C text on black | 1.80:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD7FD
oklch(88.4% 0.054 273.7)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6679FE
oklch(63.1% 0.197 273.3)
-
Step 600
600
#515EED
oklch(55.7% 0.213 273.3)
-
Step 700
700
#424CCE
oklch(49.1% 0.198 273.2)
-
Step 800
800
#363FA7
oklch(42.7% 0.165 273.3)
-
Step 900
900 (this color)
#28307C
oklch(35.2% 0.128 273.3)
-
Step 950
950
#1B214D
oklch(27% 0.081 273.9)
#28307C 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) | #003C7F | 0.040 |
| Deuteranopia (no green cones) | #00357A | 0.034 |
| Tritanopia (no blue cones) | #004351 | 0.106 |
| Achromatopsia (no color) | #383838 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28307C
#28307C
oklch(35.2% 0.128 273.3)
- #483A00
#483A00
oklch(35.3% 0.072 93.7)
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 #28307C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.051
- Twilight Blue #0A437A ΔE 0.055
- Marine #042E60 ΔE 0.063
- Midnight Blue #191970 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.069
- Cobalt #1E488F ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.070
- Royal #0C1793 ΔE 0.073
Use #28307C 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.