#283A67
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.082 266), rgb(40, 58, 103).
Aa
White text reads best on this color (11.10:1).
About this color
#283A67 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.082 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.034 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #283A67 |
| RGB | rgb(40, 58, 103) |
| HSL | hsl(223, 44%, 28%) |
| OKLCH | oklch(35.7% 0.082 266) |
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 #283A67 | 11.10:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #283A67 | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #283A67 text on white | 11.10:1 | AAA | Lc 95.5 | Preferred for body text |
| #283A67 text on black | 1.89:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9F0
oklch(88.5% 0.033 266.9)
-
Step 300
300
#AEC0E9
oklch(80.8% 0.061 266.4)
-
Step 400
400
#849FDE
oklch(70.7% 0.098 266.1)
-
Step 500
500
#6686D5
oklch(63.1% 0.125 266.2)
-
Step 600
600
#4D6EC2
oklch(55.5% 0.136 266)
-
Step 700
700
#3E5CA8
oklch(49.1% 0.127 265.7)
-
Step 800
800
#344B88
oklch(42.6% 0.105 266.5)
-
Step 900
900 (this color)
#283A67
oklch(35.7% 0.082 266)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#283A67 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) | #273F69 | 0.015 |
| Deuteranopia (no green cones) | #1E3966 | 0.013 |
| Tritanopia (no blue cones) | #00444B | 0.073 |
| Achromatopsia (no color) | #3C3C3C | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A67
#283A67
oklch(35.7% 0.082 266)
- #4D3900
#4D3900
oklch(35.7% 0.073 86.5)
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 #283A67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.049
- Marine #042E60 ΔE 0.056
- Charcoal #264653 ΔE 0.058
- Midnight Green #073B4C ΔE 0.060
Use #283A67 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.