#283963
Closest named color: Prussian Blue (#1D3557). oklch(35.2% 0.077 266), rgb(40, 57, 99).
Aa
White text reads best on this color (11.31:1).
About this color
#283963 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.077 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.028 away. White text reads best on it, at 11.31:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #283963 |
| RGB | rgb(40, 57, 99) |
| HSL | hsl(223, 42%, 27%) |
| OKLCH | oklch(35.2% 0.077 266) |
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 #283963 | 11.31:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #283963 | 1.85:1 | Fails | Lc 7.9 | Not readable |
| #283963 text on white | 11.31:1 | AAA | Lc 96.0 | Preferred for body text |
| #283963 text on black | 1.85:1 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#AFC0E7
oklch(80.8% 0.058 266.6)
-
Step 400
400
#869FDB
oklch(70.7% 0.093 266.7)
-
Step 500
500
#6887D1
oklch(63.2% 0.117 265.9)
-
Step 600
600
#506FBE
oklch(55.6% 0.128 266.2)
-
Step 700
700
#415DA4
oklch(49.2% 0.119 266)
-
Step 800
800
#354C85
oklch(42.7% 0.099 265.8)
-
Step 900
900 (this color)
#283963
oklch(35.2% 0.077 266)
-
Step 950
950
#1B263E
oklch(27.1% 0.048 264.7)
#283963 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) | #273D65 | 0.012 |
| Deuteranopia (no green cones) | #203862 | 0.011 |
| Tritanopia (no blue cones) | #044249 | 0.068 |
| Achromatopsia (no color) | #3A3A3A | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283963
#283963
oklch(35.2% 0.077 266)
- #4C3800
#4C3800
oklch(35.3% 0.072 86.2)
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 #283963, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.028
- Marine Blue #01386A ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.047
- Twilight Blue #0A437A ΔE 0.048
- Marine #042E60 ΔE 0.053
- Midnight Green #073B4C ΔE 0.055
- Charcoal #264653 ΔE 0.056
Use #283963 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.