#28304B
Closest named color: Space Cadet (#2B2D42). oklch(31.5% 0.05 270.8), rgb(40, 48, 75).
Aa
White text reads best on this color (13.00:1).
About this color
#28304B is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.050 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Space Cadet (#2B2D42), ΔE 0.017 away. White text reads best on it, at 13.00:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Space Cadet (#2B2D42) |
| Black text | 1.61:1 |
| White text | 13.00:1 |
Values
| HEX | #28304B |
| RGB | rgb(40, 48, 75) |
| HSL | hsl(226, 30%, 23%) |
| OKLCH | oklch(31.5% 0.05 270.8) |
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 #28304B | 13.00:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #28304B | 1.61:1 | Fails | Lc 0.0 | Not readable |
| #28304B text on white | 13.00:1 | AAA | Lc 99.2 | Preferred for body text |
| #28304B text on black | 1.61:1 | 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 950.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D1D9F0
oklch(88.6% 0.033 270.4)
-
Step 300
300
#B2BFE8
oklch(80.8% 0.06 271.2)
-
Step 400
400
#8A9EDC
oklch(70.8% 0.094 270.2)
-
Step 500
500
#6E84D2
oklch(63% 0.12 270.7)
-
Step 600
600
#576CC0
oklch(55.5% 0.132 271)
-
Step 700
700
#475AA5
oklch(49% 0.122 270.7)
-
Step 800
800
#3B4A86
oklch(42.7% 0.101 271)
-
Step 900
900
#323E6B
oklch(37.6% 0.079 270.9)
-
Step 950
950 (this color)
#28304B
oklch(31.5% 0.05 270.8)
#28304B 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) | #27334C | 0.009 |
| Deuteranopia (no green cones) | #23304A | 0.008 |
| Tritanopia (no blue cones) | #1C353A | 0.043 |
| Achromatopsia (no color) | #313131 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28304B
#28304B
oklch(31.5% 0.05 270.8)
- #3B3011
#3B3011
oklch(31.4% 0.049 89.8)
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 #28304B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Space Cadet #2B2D42 ΔE 0.017
- Gunmetal #293241 ΔE 0.021
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.036
- Midnight Green #073B4C ΔE 0.045
- Oxford Blue #1B263B ΔE 0.047
- Onyx #343A40 ΔE 0.048
- Marine #042E60 ΔE 0.053
Use #28304B 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.