#28307F
Closest named color: Marine Blue (#01386A). oklch(35.4% 0.132 273.2), rgb(40, 48, 127).
Aa
White text reads best on this color (11.54:1).
About this color
#28307F is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.132 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.054 away. White text reads best on it, at 11.54:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #28307F |
| RGB | rgb(40, 48, 127) |
| HSL | hsl(234, 52%, 33%) |
| OKLCH | oklch(35.4% 0.132 273.2) |
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 #28307F | 11.54:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #28307F | 1.81:1 | Fails | Lc 7.7 | Not readable |
| #28307F text on white | 11.54:1 | AAA | Lc 96.1 | Preferred for body text |
| #28307F text on black | 1.81:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FE
oklch(88.4% 0.055 273.9)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8297FF
oklch(70.6% 0.154 273.2)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#505CF1
oklch(55.6% 0.22 273.3)
-
Step 700
700
#414AD2
oklch(49.1% 0.205 273.1)
-
Step 800
800
#353EA9
oklch(42.6% 0.169 273.1)
-
Step 900
900 (this color)
#28307F
oklch(35.4% 0.132 273.2)
-
Step 950
950
#1A214F
oklch(27.1% 0.084 273)
#28307F 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) | #003D82 | 0.041 |
| Deuteranopia (no green cones) | #00357D | 0.034 |
| Tritanopia (no blue cones) | #004452 | 0.110 |
| Achromatopsia (no color) | #393939 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28307F
#28307F
oklch(35.4% 0.132 273.2)
- #493A00
#493A00
oklch(35.4% 0.073 92.5)
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 #28307F, closest first.
No curated palette has a color within ΔE 0.04 of #28307F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.054
- Twilight Blue #0A437A ΔE 0.055
- Cobalt #1E488F ΔE 0.067
- Marine #042E60 ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.067
- Midnight Blue #191970 ΔE 0.067
- Royal #0C1793 ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.074
Use #28307F 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.