#283C6F
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.091 265.9), rgb(40, 60, 111).
Aa
White text reads best on this color (10.68:1).
About this color
#283C6F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.091 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #283C6F |
| RGB | rgb(40, 60, 111) |
| HSL | hsl(223, 47%, 30%) |
| OKLCH | oklch(36.8% 0.091 265.9) |
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 #283C6F | 10.68:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #283C6F | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #283C6F text on white | 10.68:1 | AAA | Lc 94.6 | Preferred for body text |
| #283C6F text on black | 1.96:1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ACC0EE
oklch(80.9% 0.069 266.5)
-
Step 400
400
#809FE5
oklch(70.7% 0.109 265.5)
-
Step 500
500
#6185DE
oklch(63.1% 0.14 265.9)
-
Step 600
600
#496DCC
oklch(55.7% 0.153 266)
-
Step 700
700
#3A5AB0
oklch(49% 0.142 266)
-
Step 800
800
#304A8F
oklch(42.7% 0.118 266)
-
Step 900
900 (this color)
#283C6F
oklch(36.8% 0.091 265.9)
-
Step 950
950
#192543
oklch(27% 0.058 266.1)
#283C6F 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) | #254271 | 0.018 |
| Deuteranopia (no green cones) | #1A3B6E | 0.016 |
| Tritanopia (no blue cones) | #004750 | 0.078 |
| Achromatopsia (no color) | #3E3E3E | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C6F
#283C6F
oklch(36.8% 0.091 265.9)
- #513B00
#513B00
oklch(36.7% 0.075 84.9)
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 #283C6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Marine Blue #01386A ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.052
- Cobalt #1E488F ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.062
- Light Navy #155084 ΔE 0.063
- Marine #042E60 ΔE 0.063
Use #283C6F 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.