#28387E
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.12 269.9), rgb(40, 56, 126).
Aa
White text reads best on this color (10.72:1).
About this color
#28387E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.038 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #28387E |
| RGB | rgb(40, 56, 126) |
| HSL | hsl(229, 52%, 33%) |
| OKLCH | oklch(37% 0.12 269.9) |
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 #28387E | 10.72:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #28387E | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #28387E text on white | 10.72:1 | AAA | Lc 94.5 | Preferred for body text |
| #28387E text on black | 1.95:1 | Fails | Lc -8.0 | 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
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#AABEFC
oklch(80.9% 0.091 270.5)
-
Step 400
400
#7E9AFA
oklch(70.7% 0.144 270.1)
-
Step 500
500
#5F7EF7
oklch(63.1% 0.183 269.7)
-
Step 600
600
#4863E6
oklch(55.6% 0.2 269.8)
-
Step 700
700
#3A51C8
oklch(49.1% 0.186 269.8)
-
Step 800
800
#3043A2
oklch(42.7% 0.155 270)
-
Step 900
900 (this color)
#28387E
oklch(37% 0.12 269.9)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#28387E 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) | #074280 | 0.034 |
| Deuteranopia (no green cones) | #003A7D | 0.031 |
| Tritanopia (no blue cones) | #004955 | 0.100 |
| Achromatopsia (no color) | #3E3E3E | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28387E
#28387E
oklch(37% 0.12 269.9)
- #4F3D00
#4F3D00
oklch(36.9% 0.075 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 #28387E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.038
- Marine Blue #01386A ΔE 0.049
- Cobalt #1E488F ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.066
- Light Navy #155084 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.070
- Marine #042E60 ΔE 0.071
Use #28387E 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.