#283756
Closest named color: Prussian Blue (#1D3557). oklch(33.9% 0.058 263.9), rgb(40, 55, 86).
Aa
White text reads best on this color (11.85:1).
About this color
#283756 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.058 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.016 away. White text reads best on it, at 11.85:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.85:1 |
Values
| HEX | #283756 |
| RGB | rgb(40, 55, 86) |
| HSL | hsl(220, 37%, 25%) |
| OKLCH | oklch(33.9% 0.058 263.9) |
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 #283756 | 11.85:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #283756 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #283756 text on white | 11.85:1 | AAA | Lc 97.1 | Preferred for body text |
| #283756 text on black | 1.77:1 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B2C1DE
oklch(80.9% 0.044 263.6)
-
Step 400
400
#8AA1CD
oklch(70.7% 0.07 263.2)
-
Step 500
500
#6E89C0
oklch(63.2% 0.089 263.9)
-
Step 600
600
#5672AC
oklch(55.6% 0.097 263.9)
-
Step 700
700
#465F94
oklch(49% 0.091 264.2)
-
Step 800
800
#3A4E78
oklch(42.7% 0.075 264.1)
-
Step 900
900 (this color)
#283756
oklch(33.9% 0.058 263.9)
-
Step 950
950
#1D2639
oklch(27% 0.038 264.5)
#283756 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) | #2B3A57 | 0.011 |
| Deuteranopia (no green cones) | #263555 | 0.007 |
| Tritanopia (no blue cones) | #143E42 | 0.053 |
| Achromatopsia (no color) | #373737 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283756
#283756
oklch(33.9% 0.058 263.9)
- #46350F
#46350F
oklch(34% 0.058 84.2)
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 #283756, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.016
- Dark Blue Grey #1F3B4D ΔE 0.026
- Gunmetal #293241 ΔE 0.037
- Midnight Green #073B4C ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.042
- Marine Blue #01386A ΔE 0.046
- Onyx #343A40 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.048
Use #283756 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.