#283A6F
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.094 267.5), rgb(40, 58, 111).
Aa
White text reads best on this color (10.90:1).
About this color
#283A6F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.094 and its hue 267°. 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 10.90:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #283A6F |
| RGB | rgb(40, 58, 111) |
| HSL | hsl(225, 47%, 30%) |
| OKLCH | oklch(36.3% 0.094 267.5) |
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 #283A6F | 10.90:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #283A6F | 1.92:1 | Fails | Lc 8.8 | Not readable |
| #283A6F text on white | 10.90:1 | AAA | Lc 95.1 | Preferred for body text |
| #283A6F text on black | 1.92:1 | Fails | Lc -7.6 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F4
oklch(88.5% 0.039 267.9)
-
Step 300
300
#ACC0EF
oklch(80.9% 0.07 266.8)
-
Step 400
400
#819EE7
oklch(70.7% 0.112 267)
-
Step 500
500
#6384E0
oklch(63.1% 0.144 267.4)
-
Step 600
600
#4B6BCE
oklch(55.5% 0.157 267.6)
-
Step 700
700
#3C59B3
oklch(49.1% 0.147 267.4)
-
Step 800
800
#324990
oklch(42.6% 0.12 267.6)
-
Step 900
900 (this color)
#283A6F
oklch(36.3% 0.094 267.5)
-
Step 950
950
#1A2543
oklch(27.1% 0.058 267.3)
#283A6F 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) | #214071 | 0.018 |
| Deuteranopia (no green cones) | #163A6E | 0.019 |
| Tritanopia (no blue cones) | #00464F | 0.081 |
| Achromatopsia (no color) | #3D3D3D | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A6F
#283A6F
oklch(36.3% 0.094 267.5)
- #4E3B00
#4E3B00
oklch(36.3% 0.074 88.2)
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 #283A6F, 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 0.036
- Prussian Blue #1D3557 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.057
- Marine #042E60 ΔE 0.059
- Cobalt #1E488F ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.063
- Light Navy #155084 ΔE 0.068
Use #283A6F 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.