#283D67
Closest named color: Marine Blue (#01386A). oklch(36.5% 0.078 263), rgb(40, 61, 103).
Aa
White text reads best on this color (10.74:1).
About this color
#283D67 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.078 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.038 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #283D67 |
| RGB | rgb(40, 61, 103) |
| HSL | hsl(220, 44%, 28%) |
| OKLCH | oklch(36.5% 0.078 263) |
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 #283D67 | 10.74:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #283D67 | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #283D67 text on white | 10.74:1 | AAA | Lc 94.8 | Preferred for body text |
| #283D67 text on black | 1.95:1 | Fails | Lc -7.8 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAEF
oklch(88.6% 0.032 261.7)
-
Step 300
300
#ADC1E7
oklch(80.9% 0.058 263.2)
-
Step 400
400
#82A0DB
oklch(70.6% 0.093 263.4)
-
Step 500
500
#6388D1
oklch(63.1% 0.118 263)
-
Step 600
600
#4A70BF
oklch(55.6% 0.13 263.4)
-
Step 700
700
#3B5EA4
oklch(49.1% 0.12 262.8)
-
Step 800
800
#314D85
oklch(42.7% 0.099 262.8)
-
Step 900
900 (this color)
#283D67
oklch(36.5% 0.078 263)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#283D67 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) | #2B4169 | 0.013 |
| Deuteranopia (no green cones) | #233B66 | 0.009 |
| Tritanopia (no blue cones) | #00464D | 0.068 |
| Achromatopsia (no color) | #3E3E3E | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D67
#283D67
oklch(36.5% 0.078 263)
- #513A00
#513A00
oklch(36.5% 0.075 83.5)
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 #283D67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.038
- Twilight Blue #0A437A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.048
- Charcoal #264653 ΔE 0.051
- Midnight Green #073B4C ΔE 0.059
- Marine #042E60 ΔE 0.062
Use #283D67 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.