#283C6B
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.085 265.1), rgb(40, 60, 107).
Aa
White text reads best on this color (10.77:1).
About this color
#283C6B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.085 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #283C6B |
| RGB | rgb(40, 60, 107) |
| HSL | hsl(222, 46%, 29%) |
| OKLCH | oklch(36.5% 0.085 265.1) |
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 #283C6B | 10.77:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #283C6B | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #283C6B text on white | 10.77:1 | AAA | Lc 94.8 | Preferred for body text |
| #283C6B text on black | 1.94:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EB
oklch(81% 0.064 265)
-
Step 400
400
#819FE1
oklch(70.6% 0.103 265.1)
-
Step 500
500
#6286D8
oklch(63% 0.131 265)
-
Step 600
600
#4A6EC6
oklch(55.6% 0.143 265.3)
-
Step 700
700
#3B5CAB
oklch(49.2% 0.132 264.9)
-
Step 800
800
#314B8A
oklch(42.6% 0.109 265.2)
-
Step 900
900 (this color)
#283C6B
oklch(36.5% 0.085 265.1)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#283C6B 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) | #27416D | 0.015 |
| Deuteranopia (no green cones) | #1E3B6A | 0.013 |
| Tritanopia (no blue cones) | #00464E | 0.074 |
| Achromatopsia (no color) | #3E3E3E | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C6B
#283C6B
oklch(36.5% 0.085 265.1)
- #503B00
#503B00
oklch(36.6% 0.075 86)
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 #283C6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Marine Blue #01386A ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.055
- Charcoal #264653 ΔE 0.059
- Marine #042E60 ΔE 0.061
- Cobalt #1E488F ΔE 0.065
Use #283C6B 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.