#28305B
Closest named color: Prussian Blue (#1D3557). oklch(32.5% 0.077 273.5), rgb(40, 48, 91).
Aa
White text reads best on this color (12.61:1).
About this color
#28305B is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.077 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.022 away. White text reads best on it, at 12.61:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.66:1 |
| White text | 12.61:1 |
Values
| HEX | #28305B |
| RGB | rgb(40, 48, 91) |
| HSL | hsl(231, 39%, 26%) |
| OKLCH | oklch(32.5% 0.077 273.5) |
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 #28305B | 12.61:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #28305B | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #28305B text on white | 12.61:1 | AAA | Lc 98.5 | Preferred for body text |
| #28305B text on black | 1.66:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B4BFE7
oklch(81% 0.058 273)
-
Step 400
400
#8E9DDA
oklch(70.8% 0.091 273.2)
-
Step 500
500
#7383D0
oklch(63% 0.117 273.7)
-
Step 600
600
#5C6CBD
oklch(55.7% 0.127 273.2)
-
Step 700
700
#4C59A3
oklch(49% 0.119 273.7)
-
Step 800
800
#3E4984
oklch(42.6% 0.098 273.6)
-
Step 900
900 (this color)
#28305B
oklch(32.5% 0.077 273.5)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#28305B 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) | #1E355D | 0.018 |
| Deuteranopia (no green cones) | #18315A | 0.021 |
| Tritanopia (no blue cones) | #113941 | 0.067 |
| Achromatopsia (no color) | #333333 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28305B
#28305B
oklch(32.5% 0.077 273.5)
- #403300
#403300
oklch(32.6% 0.067 93.2)
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 #28305B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.022
- Marine #042E60 ΔE 0.039
- Marine Blue #01386A ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.049
- Gunmetal #293241 ΔE 0.049
- Midnight Green #073B4C ΔE 0.057
- Oxford Blue #1B263B ΔE 0.067
Use #28305B 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.