#283765
Closest named color: Prussian Blue (#1D3557). oklch(34.9% 0.083 268.3), rgb(40, 55, 101).
Aa
White text reads best on this color (11.50:1).
About this color
#283765 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.083 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.030 away. White text reads best on it, at 11.50:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.50:1 |
Values
| HEX | #283765 |
| RGB | rgb(40, 55, 101) |
| HSL | hsl(225, 43%, 28%) |
| OKLCH | oklch(34.9% 0.083 268.3) |
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 #283765 | 11.50:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #283765 | 1.82:1 | Fails | Lc 7.5 | Not readable |
| #283765 text on white | 11.50:1 | AAA | Lc 96.4 | Preferred for body text |
| #283765 text on black | 1.82:1 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#B0C0EA
oklch(81% 0.062 268.6)
-
Step 400
400
#869EDF
oklch(70.6% 0.099 268.3)
-
Step 500
500
#6985D6
oklch(63.1% 0.126 268.2)
-
Step 600
600
#516DC3
oklch(55.6% 0.137 268.2)
-
Step 700
700
#425BA9
oklch(49.2% 0.128 268.1)
-
Step 800
800
#364A89
oklch(42.6% 0.107 268.3)
-
Step 900
900 (this color)
#283765
oklch(34.9% 0.083 268.3)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#283765 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) | #233C67 | 0.015 |
| Deuteranopia (no green cones) | #1B3764 | 0.016 |
| Tritanopia (no blue cones) | #014149 | 0.073 |
| Achromatopsia (no color) | #393939 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283765
#283765
oklch(34.9% 0.083 268.3)
- #493700
#493700
oklch(34.7% 0.071 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 #283765, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.030
- Marine Blue #01386A ΔE 0.033
- Twilight Blue #0A437A ΔE 0.049
- Marine #042E60 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.055
- Midnight Green #073B4C ΔE 0.059
- Gunmetal #293241 ΔE 0.063
Use #283765 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.